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IrinaVladis [17]
3 years ago
15

A student says: Potassium (K) always has 20 protons. Explain why the student is incorrect.

Chemistry
1 answer:
Katen [24]3 years ago
5 0

Explanation:

19

Potassium/Atomic number

This tells you that potassium has 19 protons and - since the number of protons is the same as the number of electrons- also 19 electrons. To find out the number of neutrons you have to look at the atomic mass or weight of the element. This can also be found in the periodic table.

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1. Answer:

B) An allele is one form of a gene.

Explanation:

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2. Answer;

B) Alleles

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5 0
2 years ago
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The amount of matter in an object is its
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7 0
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What mass of sodium chloride contains 4.59 x 10 24 formula units?
shtirl [24]
The term formula units means molecules.

Then, what you are looking for is the mass in 4.59*10^24  molecules.

The procedure involves to convert the 4.59 * 10^24 molecules into moles and use the molar mass of the sodium chloride.

1) Number of moles = 4.59 * 10^24 molecules / (6.02 * 10^23 molecules/mol) = 7.62 mol

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3) mass of NaCl = molar mass *  number of moles = 58.44 g/mol * 7.62 mol = 445.31 g of NaCl

Answer: 445.31 g of NaCl.

 
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