1.2 Atomic structure

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Question 25

A student records the numbers of protons, neutrons and electrons in four ions.

Ion	Protons	Neutrons	Electrons
$23Na+{}^{23}\mathrm{Na^{+}}$	11	12	12
$19F−{}^{19}\mathrm{F^{-}}$	9	10	10
$40Ca2+{}^{40}\mathrm{Ca^{2+}}$	20	20	22
$27Al3+{}^{27}\mathrm{Al^{3+}}$	13	13	10

For which ion are all three numbers correct?

[1]

$23Na+{}^{23}\mathrm{Na^{+}}$

$27Al3+{}^{27}\mathrm{Al^{3+}}$

$40Ca2+{}^{40}\mathrm{Ca^{2+}}$

$19F−{}^{19}\mathrm{F^{-}}$

Markscheme

1.2 Atomic structure Questions

GCSE
Chemistry
1.2 Atomic structure

101 exam-style questions on OCR GCSE Chemistry 1.2 Atomic structure, covering 1.2.1 Development of the atomic model, 1.2.2 The nuclear model and the size of atoms, and 1.2.3 Subatomic particles in atoms and ions. Each one has a worked solution and a mark scheme showing where the marks go.

Question bank·1.2 Atomic structure