🔢 Atomic & mass numbers

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Last updated 8:56 AM on 9/6/26
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5 Terms

1
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What does the atomic number (Z) represent?

The number of protons in the nucleus.

2
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What does the mass number (A) represent?

The total number of protons and neutrons in the nucleus.

3
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What is the formula for calculating the number of neutrons?

Number of neutrons = mass number − atomic number.

4
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In a neutral atom, how does the number of electrons compare with the number of protons?

They are equal.

5
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Why is a neutral atom electrically neutral?

It has equal numbers of positively charged protons and negatively charged electrons, so the charges cancel.