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2017 O Level Chem P1 Q4 — Atomic Structure / Isotopes Solution

Atomic Structure / Isotopes 2017 O Level Pure Chemistry · Paper 1 · Q4

Question

Four atoms are shown. ¹⁴₆C ¹⁵₇N ¹⁶₈O ¹⁷₉F Which statement about all four atoms is correct?

AThey have the same number of electrons.
BThey have the same number of neutrons.
CThey have the same number of nucleons.
DThey have the same number of protons.

Correct answer: B

Video Solution

Explanation

Answer: B. The number of neutrons is the mass number minus the proton number: carbon-14 has \(14 - 6 = 8\), nitrogen-15 has \(15 - 7 = 8\), oxygen-16 has \(16 - 8 = 8\) and fluorine-17 has \(17 - 9 = 8\). All four atoms have 8 neutrons.

Their numbers of protons, electrons and nucleons are all different, so only the neutron count is the same.

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