please help me fast!!

Answer:

That is true

Explanation:

The group determines the valence electrons in the outer shell , the period determines the number of energy levels.

Answer:

Explanation:

A rainbow is a meteorological phenomenon that is caused by reflection, refraction and dispersion of light in water droplets resulting in a spectrum of light appearing in the sky. It takes the form of a multicoloured circular arc. Rainbows caused by sunlight always appear in the section of sky directly opposite the Sun.

Answer:

135 kPa

Explanation:

Explanation:

vinegar or acetic acid is an acid

Answer:

Lyman series of hydrogen atom lies in the ultraviolet region, Balmer series lies in visible region, Paschen series lies in near infrared region whereas Bracket, Pfund as well as Humphrey series lie in far infrared region of electromagnetic spectrum.

I think the lake because of how heat is transferred or something. Just check out the first law of thermodynamics.

Answer:

the woman

Explanation:

Answer:

I don't understand but I can tell u this:

Na has one extra valence electron and Cl has one missing one. Chemical reactions and forming of compounds is all in the electrons and not the nucleus. So, when highly reactive Na mixes with Cl, they form a stable compound called NaCl, or table salt.

If we are making one molecule of sodium chloride, we need one sodium atom and one chlorine atom. The formula of sodium chloride is NaCl.

Sodium chloride is an ionic compound formed by the combination of sodium and chlorine atoms. One molecule of sodium chloride contains one sodium and one chlorine atom to form NaCl. Now if we are making one mole of NaCl, we need 6.022 × 10²³ atoms of each element.

Sodium is a metal and possess extra one electron in its valence shell. Chlorine have 7 valence  electrons thus, it needs one more electron to attain octet. Sodium donates its electron to chlorine and gains a positive charge.

Chlorine gains a negative charge by accepting the electron from sodium. This opposite charge clouds undergo electrostatic force of attraction. And thus, it an ionic bond forms between them.

To find more on NaCl, refer here:

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Answer:

Explanation:

Illuminator. is the light source for a microscope, typically located in the base of the microscope. Most light microscopes use low voltage, halogen bulbs with continuous variable lighting control located within the base.

Answer:

I believe it is B.

Explanation:

because an element is a for sure pure substance and I am sure a compound is too. I appologize if I am wrong.

Answer:

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Explanation:

Answer:

2 waves

Explanation:

If Frank creates 20 waves every second then the way you solve is turn it into a proportion 20 waves/10 secs = x/1 sec which then turns into the equation of 10x=20 where x=2 hence Franks creates 2 waves every second.

Answer:

reversible

Explanation:

The freezing of mercury is reversible because solid mercury can be melted.

Answer:

If a gas contracts by 1/273 of its volume for each degree of cooling, it should contract to zero volume at a temperature of –273°C; this is the lowest possible temperature in the universe, known as absolute zero.It appeared that an “ideal gas” at constant pressure would reach zero volume at what is now called the absolute zero of temperature. Any real gas actually condenses to a liquid or a solid at some temperature higher than absolute zero. Therefore, the ideal gas law is only an approximation to real gas behaviour.

Answer:

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Answer:

C po answer ko

Explanation:

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Answer:

See Explanation.

Explanation:

Element Name: Neon (check a periodic table)

Atomic Number: 10 (number of protons)

Atomic Mass: 20 (number of protons + number of neutrons [electrons have negligible mass])

Protons: 10 (P in the black circle)

Electrons: 10 (number of red dots)

Neutrons: 10 (N in the black circle)

Valence Electrons: 8 (number of red dots on the outermost ring)

If you have any questions, let me know!!

Answer:

To dissolve an ionic compound

Explanation:

the water molecules must be able to stabilize the ions that result from breaking the ionic bond. They do this by hydrating the ions. Water is a polar molecule. ... When you place an ionic substance in water, the water molecules attract the positive and negative ions from the crystal.

Answer:

.............hope it helps.......

Answer:That's 25.8 g of calcium carbonate In 100 g of the sample.

Explanation:

brainliest pls

Answer:

Explanation:

Answer:

Its a liquid cause it flows

Explanation:

think about it none of the others make sense ice is a solid and its clear

something like a wall can be thick but it doesn't flow

Answer:

S+O2⇒SO2

Explanation:

Answer:

The balanced equation is S + O2 → SO2

Explanation:

Sodium is a highly reactive metal since it has 1 valence electron, while Iodine is a less reactive non metal with 7 valence electrons.

Answer:

The Bohr atomic model did not make correct predictions of large- sized atoms and provided sufficient information only for smaller atoms.

Answer:

100g......sieiekeskslapaokdkz

Answer:

what about chemistry notes​?

Explanation:

The number of atoms in one mole of Calcium and one mole of Carbon Dioxide is the same.

The number of atoms is determined by Avogadro's number (a constant number that determines the atoms per mole).

Avogadro's number is equivalent to 6.02 x 10²³ atoms.

This means one mole of each element contains 6.02 x 10²³. However, this number of atoms changes according to the amount of the substances or moles.

How many atoms does 1 mole of Calcium and 1 mole of Carbon Dioxide contain?

Considering these are two different substances but the number of moles is the same (1 mole each) the number of atoms is equal to Avogadro's number or 6.02 x 10²³ atom.

Learn more about atoms in: https://brainly.com/question/13981855?referrer=searchResults

Answer:

so that the can keep reusing it and reusing it instead of wasting materials

Explanation:

you very welcome have a good day