Gallium has three valence electrons.
Elements in the periodic table are classified into groups and periods. Elements in a given group have the same number of valence electrons on their outermost shell while the elements in a period have the same number of shells.
All the elements in group 13 have three electrons in their outermost shell. Gallium is an element of group 13. This means that gallium also has three electrons in its outermost shell(valence electrons).
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Gallium has 3 valence electrons (1 electron in the 4p orbital and 2 electrons in the 4s orbital) because the valence electrons are those located in the outermost energy level of an atom.
Gallium has an atomic number of 31, which means it has 31 electrons in total. The electron configuration of gallium can be represented as [Ar] 3d¹⁰ 4s² 4p¹.
Within the n=4 shell, gallium has electrons in the 4s and 4p orbitals. The 4s orbital can hold a maximum of 2 electrons, while the 4p orbital can hold a maximum of 6 electrons. In the case of gallium, there is 1 electron in the 4p orbital.
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Compare which element would have larger first ionization energy: an alkali metal in Period 2 or an alkali metal in Period 4?
AW: I think it would be alkali metal on period 2
Answer:
An alkali metal present in period 2 have larger first ionization energy.
Explanation:
Ionization energy:
The amount of energy required to remove the electron from the atom is called ionization energy.
Trend along period:
As we move from left to right across the periodic table the number of valance electrons in an atom increase. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases because it is very difficult to remove the electron from atom and more energy is required.
Trend along group:
As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.
As the size of atom increases the ionization energy from top to bottom also decreases because it becomes easier to remove the electron because of less nuclear attraction and as more electrons are added the outer electrons becomes more shielded and away from nucleus. Thus alkali metal present in period 2 have larger ionization energy because of more nuclear attraction as compared to the alkali metal present in period 4.
For the following situations, describe the contact and non contact forces that are involved.
A. A book sitting on a shelf
B. A soccer player kicking a ball; the ball soaring through the air and landing on the ground
C. A hiker in the woods reading her compass to determine which direction to go
D. A child on a sled; first, the child is sitting at the top of the hill, waiting his turn; then, the child pushes off and slides down the hill, eventually coming to a ston
Answer:
D
Explanation:
Bc I got it right
Answer:
For A: the contact I think would be the bookshelf holding it up the non-contact force would be gravity making it so the book would stay where it was put.
For B: the contact force would be the ball being kicked and the non-contact would be the gravity pulling it back to the ground.
For C: A hiker in the woods reading her compass to determine which direction to go The contact would be her holding the compass and moving around the non-contact would be the compass arrow turning every time she moves.
For D: The child on a sled for the contact force would be the person pushing the little kid down the hill the non-contact force would be the gravity that would be keeping the kid going down the hill and gravity stopping the kid at the bottom of the hill.
Explanation:
Have the same assignment and these are the answers I gave. Hope this helps someone!
TIME REMAINING
01:29:12
Which technology has helped improve scientists' ability to gather scientific data about the movement of sea turtles?
O satellite tracking
O thermometers
O probeware
microscopes
the first one satellite tracking
Answer:
I believe the answer is A. Or the 1st dot.
Explanation:
1. Identify the layer of Earth that is made primarily of silicon and oxygen.
Crust
Mantle
Core
Answer:The crust
Explanation:
What are some ways each person could reduce air pollution and energy consumption? a. adjust the temperature settings - hotter in winter and cooler in summer b. adjust the temperature settings - cooler in winter and hotter in summer c. cut down trees near the house d. replace plumbing fixtures that leak Please select the best answer from the choices provided A B C D
Answer:
b.
adjust the temperature settings - cooler in winter and hotter in summer
Explanation: I took the quiz
Answer:
B. adjust the temperature settings- cooler in winter and hotter in summer
Explanation:
edge 2020
Which is an example of what should be done in case of a laboratory accident? Wear appropriate lab attire. Read directions completely. Do not try to clean up a spill. Remain in the area.
Answer: C. Do not try to clean up a spill.
Explanation:
As a star uses up its hydrogen supply, it changes from a main sequence star to a -
A.) dwarf
B.) supernova
C.) black hole
D.) giant
As a star uses up its hydrogen supply, it changes from the main sequence star to a Giant. Thus, the correct option for this question is D.
What is a Star?A star may be defined as a type of huge celestial body that is generally constructed of hydrogen and helium that produce light and heat from the churning nuclear forges inside their cores. They are the luminous bodies that are visible in the sky at night.
A giant is a type of star that has utilized its hydrogen supply in its cores and transformed itself into the thermonuclear fusion of hydrogen in the shell that envelops its surroundings.
This creates an outwards force and stimulates fusion that initiates to increase and hence the star can not able to maintain its equilibrium longer.
Therefore, as a star uses up its hydrogen supply, it changes from the main sequence star to a Giant. Thus, the correct option for this question is D.
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5. An object is a regular, rectangular, solid with dimensions of 2 cm by 3cm by 2cm. It has a mass of 24 g. find its density.
Answer:
Density, D = 2g/cm^3
Explanation:
Given the following data;
Length = 2cm
Width = 3cm
Height = 2cm
Mass = 24g
Density = ?
Volume of a rectangular solid (V) = Length × Weight × Height
Therefore, V = L× W × H
Substituting the values, we have;
[tex]V = 2 *3 * 2 = 12[/tex]
V = 12cm
Density can be defined as the ratio of mass to volume i.e mass all over volume.
Mathematically, [tex]Density = \frac{Mass}{Volume}[/tex]
[tex]D = \frac{M}{V}[/tex]
Substituting the values, we have;
[tex]D = \frac{24}{12}[/tex]
Density, D = 2g/cm^3
Hence, the density of the rectangular solid is 2g/cm^3.
True or False? Nitrogen can get back into the atmosphere when dead plants and animals are decomposed by bacteria. The bacteria break down the larger molecules into smaller ones including nitrates, ammonia, and ultimately N2. True or Fralse
Answer: True
Explanation:
Answer:
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The chemical symbol for silver oxide, an ionic compound used to make button batteries, is made of silver and
oxygen and has a chemical formula of Ag20.
Answer 2 and 1
Answer:
2 Silver Ions
1 Oxygen Ion
Explanation:
Edg2021
The chemical symbol for silver oxide is not Ag₂0. The correct chemical formula for silver oxide is Ag₂O.
Silver oxide (Ag₂O) is an ionic compound composed of silver ions (Ag⁺) and oxide ions (O₂⁻). It is commonly used in button batteries as a cathode material. In this compound, two silver ions combine with one oxide ion to form a stable structure.
The chemical formula Ag₂O indicates that there are two silver ions (Ag⁺) and one oxide ion (O₂⁻) in each formula unit of silver oxide. The subscript 2 after Ag indicates that there are two Ag⁺ ions present, while the absence of a subscript after O indicates that there is one O₂⁻ ion.
Hence, the chemical formulae are discussed above.
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Question
The measure of molecular movement is known as
dew point
temperature
condensation
evaporation
What are the Oxidation numbers for H2AsO4-
i cant understand your question define briefly
A hydrogen electron is elevated from level 1 to level 2. Another electron is elevated from level 2 to level 4. The transition requiring the greatest energy change is
Answer:
the answer is level 2 to level 4
Explanation:
1. The term _________
refers to the chemical potential of hydrogen.
Answer:
PH
Explanation:
Answer:
Explanation:
pH but i'm really not sure
Explain what you think a compound is
Answer:
a thing that is composed of two or more separate elements; a mixture.
Explanation:
6.
Which best represents a particle containing 28 protons, 26 electrons, and 34 neutrons?
A Fe2-
B
54
2+
28N;
C%2Fe2-
DSNi2+
Answer:
Ni^2+
Explanation:
The following data were obtained from the question:
Proton = 28
Electron = 26
Neutron = 34
Next, we shall determine the atomic number of the element.
Atomic number of an element is simply defined as the number of protons in the atom of an element.
Thus,
Atomic number = proton number
Proton = 28
Atomic number = proton number = 28
Atomic number = 28
Therefore, the element is Nickel since no two elements have the same atomic number.
Finally, we shall determine the charge on the Nickel atom as follow:
Proton = 28
Electron = 26
Charge on atom =
Charge on atom = Proton – Electron
Charge on atom = 28 – 26
Charge on atom = +2
Therefore, we can represent the Particle as Ni^2+
Please help me answerrr
Answer:
0.00439 g/mL
Explanation:
plz mark as brainliest if it helps.
The results of an investigation are the
(Blank)
Answer: ending results
Explanation:
help please!! will reward brainliest
Answer:
C
Explanation:
just did it and got good luck
If Mr. Murchison is testing out how the light in his classroom affects how sleepy his students get, what should his dependent variable be?
Answer:the dimmer the light is,the more sleepy the students become
Explanation:
What makes one atom different from another? The number of______in the_____
Answer:
protons in the nucleus
Harvey mixes two liquids. Which observation of the new mixture most likely indicates a precipitate is O A. a cloudy appearance OB. a bubble formation OC. a change in color O D. a change in odor
Answer:
A cloudy appearance!!
Explanation:
Hope it helps, just took a quiz.
Answer:
a cloudy appearance
Explanation:
i have big brain
Which of the following is true about matter?
Answer:
Full question plssssss what should we find
The second part of the cell theory is that he cell is the smallest unit of _______ and _______ in living things
Answer:
a.life
b.organization
Gases deviate from tidal gas behavior because their particles:
Answer:
Explanation:
At low temperatures or high pressures, real gases deviate significantly from ideal gas behavior.
The kinetic theory assumes that gas particles occupy a negligible fraction of the total volume of the gas. It also assumes that the force of attraction between gas molecules is zero.
I hoped I helped you! :)
What substance is produce when hydrogen burn?...
Answer:
Water
Explanation:
hydrogen + oxygen = water
Which of the following is NOT a subatomic particle of an atom?
Neutron
Nuclear wall
Proton
Electron
Answer:
B
Explanation:
It is Nuclear wall which is the second one
Which of these would have lowest kinetic energy
Boiling water
Ice water
Refrigerated water
Water at room temperature
Answer:
The answer is ice water, since the particles of a solid have very low kinetic energy.
Explanation:
Answer:
Iced water.
Explanation:
It's a solid. Within a given substance, such as water, particles in the solid state have the least amount of kinetic energy.
As water freezes, it does so because after thermal energy leaves the particles, the average translational+rotational kinetic energy decreases, but the total average kinetic energy does not... and the temperature does not change either.
A single paper clip weighs about one gram. So 10 paper clips would weigh?
C. A paramecium is a single-celled organism that lives in ponds. It travels at a rate of 2,000 micrometers per second. What is the speed of the paramecium in meters per hour?
Answer:
7.2 meters per hour
Explanation:
It is given that,
The speed of a paramecium is 2,000 micrometers per second.
We need to find the speed of the paramecium in meters per hour.
We know that,
[tex]1\ \mu m=10^{-6}\ m[/tex]
and
1 hour = 3600 seconds
[tex]v=2000\ \dfrac{\mu m}{s}\\\\=2000\times \dfrac{10^{-6}\ m}{(\dfrac{1}{3600})\ s}\\\\=7.2\ \text{meters/hour}[/tex]
Hence, the speed of the paramecium is 7.2 meters per hour.