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Chemistry

1 answer:

Reika [66]3 years ago

5 0

Answer:

1. A

2. D

3. D

4. B

Explanation:

Sulfer is in the 3rd period of the periodic table meaning that 2 periods came before it hence the 2 electron shells and it is in the 6th group hence the 6 valence electrons.

Using this logic we know that the element in the 5th period and the 7th group which would be Iodine

We also know that the element in the 4th period and 8th group is Krypton

The Lewis dot model is more commonly used to show chemical reactions, I haven't heard of the addition or subtraction models before so there's a chance that it may only be part of your curriculum, or they are answers made up for your multiple choice.

Hope this helps!!!

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What is the abbreviation for the unit nanometers?

Mila [183]

Answer: nn

Explanation:

The nanometre (international spelling as used by the International Bureau of Weights and Measures; SI symbol: nm) or nanometer (US spelling) is a unit of length in the metric system, equal to one billionth (short scale) of a metre (0.000000001 m).

3 0

3 years ago

How many chlorine atoms are found in 8.3 moles of chlorine?

erik [133]

Answer:

5*10²⁴ chlorine atoms are found in 8.3 moles of chlorine.

Explanation:

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023*10²³ particles per mole. Avogadro's number represents a quantity without an associated physical dimension, so it is considered a pure number that allows describing a physical characteristic without an explicit dimension or unit of expression. Avogadro's number applies to any substance.

Then you can apply the following rule of three: if 1 mole of the compound contains 6.023 * 10²³ atoms, 8.3 moles of the compound how many atoms does it have?

$amount of atoms=\frac{8.3 moles*6.023*10^{23}atoms }{1 mole}$