Name an element that has the same number of electron energy levels as Calcium (Ca)?
Answer:
aluminum?
Explanation:
Mendeleev placed thallium (Tl) in the same group as lithium (Li), sodium (Na), potassium (K), rubidium (Rb), and cesium (Cs). However, the modern periodic table doesn’t place thallium in this group. Use the periodic table to find the properties of thallium. Explain why Mendeleev might have grouped thallium in the same group as lithium and sodium. Also explain how thallium is different from the other five elements.
Answer:
When observing how thallium reacts with the air of the earth's atmosphere, its hardness or resistance resembled sodium, it was not investigated further to classify it correctly
Explanation:
Now it is known that they contain different numbers of valence electrons and that thallium is a heavy metal like lead and that they have similar characteristics except for their melting point where thallium is higher.
Mendeleev might have grouped thallium in the same group as lithium and sodium due to many reasons:
Since, all are metals so they need to be placed in the same group.The particular group is referred to (group one) is actually the most reactive metals on the periodic table. These are the elements that most easily loose their electron from their outer valence shell. Thus each element can easily give up their valence electron in a reaction to form a positive ion. These are the most easily reactive in this way.When observing how thallium reacts with the air of the earth's atmosphere, its hardness or resistance resembled sodium, it was not investigated further to classify it correctly.Now it is known that they contain different numbers of valence electrons and that thallium is a heavy metal like lead and that they have similar characteristics except for their melting point where thallium is higher.
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how many chromium (II) ions would bond with 2 phosphate ions?
Answer:
ummmm I don't know of sorry
Which condition must be met for conduction to occur?
A:particles must be large
B:articles must be small
C:particles must be in contact
D:particles must be spread apart
Answer:
D
Explanation:
when you boil water in a pot and put a lid or something meatal over it when it reaches a certain temperature it gets steamy and during that it will get hyper and run around in circles and will go up but since the meatal or glass lid is there it will stop it and you will see water droplets on the inside.
Answer:
d
Explanation:
3. Which graph indicates that one of the runners started 10 meters ahead of the other?
A
B
30
Distance from starting line (meters)
Distance from starting line (meters)
2
1
2
Time seconds)
The seconds
с
D
Distance from starting line (meters)
Distance from starting line (meten
GE
1
2
Time (seconds)
The seconds)
A graph A
O B. graph B
O C. graph
O D. graph D
Answer:
A
Explanation:
I think, I hope it is correct
this ionic compound is named incorrectly.
1. find and describe the mistake
2. correctly name the compound
CaCl² - Calcium Chlorine
CuS - Copper Sulfide
Li³P - Trilithium Phosphide
CuBr - Copper(II) Bromide
NaOH - Sodium Hydrogen Oxide
1. Ionic compounds are named using the cation and the anions in the compounds respectively.
The name of the cation remains thesame as it's element while the anions name changes by adding another suffix to the elements name.
Sometimes, the number of positive charge of a cation is added in front of it's name before adding the anion's name.
2. Correct names of the compounds above
CaCl² - Calcium chloride
CuS - Copper Sulphate
Li³P - Lithium Phosphide
CuBr - Copper (1) Bromine
NaOH - Sodium Hydroxide
Read More:
When naming a compound, which of these is written first?
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A student needs to make 0.855 L of a sodium bromide solution for an experiment. The concentration of the required solution is 0.350 M. How many grams of sodium bromide will he need to use?
Answer:
Explanation:
Molarity = moles/liters of solution
moles = molarity x Liters of solution
= 0.350 m/L x 0.855 L
= 0.299 mol
mass = moles x molar mass
= 0.299 mol x 102.89 g/ms
= 30.78 grams
How to calculate the frequency of a wave?
Answer:
count each wave crest
Explanation:
hope this helps
25 PT Which statement about exothermic reactions is true?
A.Electrons are transferred in an ionic bond.
B.Electrons are shared in an ionic bond.
C.Protons are transferred in an ionic bond.
D.Protons are shared in an ionic bond.
Answer: A
Explanation: electrons are transfers in iconic bonds they are completely transfers from one adam to another
Elements and compounds at the beginning of a reaction are ____.
They are called the Reactants
A reactant? If i understood correctly.
An empty beaker weighs 31.89 g.
When completely filled with water, the beaker and its contents have a total mass of 305.55 g. What volume does the beaker hold?
Use d = 1.00 g/mL as the density of water.
Explanation:
difference of masses - (305.55-3189)g = 273.66g
density of water = 1g/mL.
therefore, volume = m/density (ρ)
= 273.66/1 = 273.66mL.
so, the beaker can hold 273.66mL.
hope this helps you.
if you think about similarities between elements instead of differences, how can that make understanding matter a little bit easier?
100 points pls helpppppp?
Answer:
It’s the chemical change then a new substance is formed.
Explanation:
Explain how ions are accelerated, detected and have their abundance determined in a time of flight (TOF) mass spectrometer
Your own words
Answer:
mass spectrometers separate ions by time without the use of a magnetic field. All ions are accelerated by an electric field
please help! will give brainliest!!! match each of the terms on the right with the letters on the right.
Answer:
Metal -c
Explanation:
All living organisms do cellular respiration and give off carbon dioxide. TRUE OR FALSE
Answer:
false
Explanation:
All living things use cellular respiration to turn organic molecules into energy. Cellular respiration is the chemical process of breaking down food molecules in order to create energy in the form of adenosine triphosphate (ATP). ... This is called aerobic respiration.
Cellular respiration takes place in all living organism despite the level of organism and produces carbon dioxide and water.
What is cellular respiration?Cellular respiration is the process of breaking food or glucose by the action of biological catalysts to form carbon dioxide and water. This process goes through several stages including some electron transport chains
There are both aerobic and anaerobic respiration. Aerobic respiration takes place in the presence of oxygen whereas anaerobic respiration needs no oxygen.
Every living organism consume food and digest and from the food the cell makes energy by cellular respiration. Hence, the fact that all living organism do cellular respiration is true.
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imagine a basketball filled with liquid water. Would the basketball still hold the same number of molecules ? Can you use 22.4L/mol as the molar volume for liquid water?
Answer:
the ball will have more molocules
Explanation:
the ball has a heaveir mass
No, the basketball hold more number of molecules due to presence of water in it.
When the basket ball is filled with water so the empty spaces present between gas molecules also filled and increase occurs in the concentration of molecules.
We can't use 22.4L/mol as the molar volume for liquid water because it is a molar volume of ideal gas at STP and we know that liquid water is not a gas, it is a liquid so we can conclude that more molecules are present in the basket ball due to addition of liquid water.
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Question 1 of 10
What happens inside a closed car on a hot day?
A. The pressure inside the car increases.
B. The molecules of gas slow down.
C. The number of molecules increases.
D. The volume inside the car increases.
Answer:
Explanation:
What happens inside a closed car on a hot day?
A. The pressure inside the car increases.
B. The molecules of gas slow down.
C. The number of molecules increases.
D. The volume inside the car increases.
The sunlight in the closed car increases the temperature, which makes the air molecules move faster, hitting the interior walls and windows more rapidly and thus increasing the pressure.
The answer is A.
That is why you never leave car windows rolled up on a hot day with a young child or pet inside. They can get sick and possibly die from overheating.
The substances which are not found in the periodic table are called ?
Answer:
undiscovered elements (by their atomic number).
(I don't know if this is the correct answer)
Explanation:
The letters “J” and “Q” are the only two letters not found on the periodic table. These letters do not occur in either element symbols or element names.
HELP QUICK An unknown substance is a liquid and is red in color.
How can you determine if the unknown is a mixture or a pure substance?
WILL MARK AS BRAINLIEST IF CORRECT
Is oxygen likely to gain or lose electrons when boding? EXPLAIN.
Answer:
yes covalent bonding is the scientific term for this. This is simply four elements in groups 15 16 and 17 to receive electrons than to lose them oxygen atoms, for example, acquired two electrons to create see you two ions. The electron configuration is similar to that of the noble gas Neon.
Differentiate the particles in terms of location, charge, and relative
Explanation:
location:
charge: 89%
relative:t h e y r e f i n e , a n d so a n d t h e n
t h a n k s f o r t h e p o i n t s
if our body is 60% made out of water why don't we evaporate?
Let's see it you guys can solve this!
Answer:
ok
Explanation:
Water has a high heat capacity, so it will be harder for the fire to evaporate it
A ball rolls down a ramp. It goes through a
straight tunnel, and then curves to the left.
Based on this information, which statement is
true about the ball's motion?
answer me
short answer
Explanation:
B. 1) Tritium is the isotope of Hydrogen (H).
2) Mass of an Electron is 9.10938356 × 10-³¹ Kg.
3) Molecular mass of Carbon dioxide (CO2)
=> Molecular mass of carbon = 12g
Molecular mass of oxygen= 16g
molecular mass of CO2 = [12 + (16 X 2)]g
= (12 + 32)g
= 44 g
4) Dalton has given its Atomic Theory in the year 1803.
5) Nucleus is discovered by
= Ernest Rutherford discovered the nucleus of the atom in 1911.
hope this helps you.
Which marine ecosystem depends on upwelling from the seafloor to maintain its high productivity?
Answer:n some ways, upwelling can be a mixed blessing to coastal ecosystems. It can infuse coastal waters with critical nutrients that fuel dramatic productivity,
Explanation:
Coral reefs is the marine ecosystem which depends on upwelling from the seafloor to maintain its high productivity.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
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Which two kingdoms are the only prokaryotes
Answer:
There are two kingdoms of prokaryotes. These are the bacteria (or eubacteria ) and the archaebacteria (or the Archaea ).
Explanation:
Which correctly explains the relationship between predators and prey?
when the number of prey increase the number of predators will increase
when the number of prey decrease, the number of predators will increase
when the number of prey increase, the number of predators will decrease
BRAINLIESTTT
Answer:
When the number of prey increase the number of predators will increase.
Explanation:
This is because the predators have more food available, which will make their population grow.
Which low-energy state of condensed matter is characterized by structural rigidity and resistance to changes of shape or volume?
Solid is the low energy state of condensed matter is characterized by structural rigidity