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Paper 2 · November 2018 · Atomic Structure and Bonding

Element E has an electron arrangement of 2,8,7 across its three shells. What is the number of protons in atom E?

A7

B16

C17

D18

Explanation

The total number of electrons (and therefore protons in a neutral atom) equals the sum of electrons in all shells: 2 + 8 + 7 = 17.

Derived from ZIMSEC Chemistry 4024/2 Paper 2 Theory, November 2018, Q1

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