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The table below gives the numbers of protons, electrons, and neutrons in four atoms.
Atom
Number of protons
Number of neutrons
Number of electrons
1
19
19
18
12.
19
19
3
19
18
10
9
19
19
14
10
Based on the table, which atom has a charge of -1?
1
3
04
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Answer:

C

Explanation:

  • A neutral atom has same number of protons and electrons.
  • If number of protons is greater in an atom than electrons, then it will have positive charge.
  • If number of protons is less than number of electrons, then atom will gain negative charge.

So, for 3rd atom, the number of protons is less than number of electrons and it will gain -1 charge.

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