Test Index

BECE Science 2017 Paper

Question : 18

Total: 40

Solution:

The first shell of an atom takes maximum of

{2}

electrons and the subsequent shells take maximum of

{8}

electrons

Number of protons equals number of electrons in a neutral atom.

Since there are 17 protons, the atom has 17 electrons

First shell will have

{2}

electrons

Second shell will have 8 electrons

Third shell will have the remaining

{7}

electrons

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