2.2 Atomic Structure & the Periodic Table | Cambridge O Level Chemistry Topic Questions 2023

1

8 marks

Complete the following table which gives the number of protons, electrons and neutrons in each of the five particles.

particle	number of protons	number of electrons	number of neutrons
	19	19	20
${}_{26}^{56}{Fe}$
	3	2
${}_{31}^{70}{Ga}^{3 +}$
	34	36	45

How did you do?

Did this page help you?

1a4 marks

The symbols of six particles are shown below.

Na⁺

Ca²⁺

Kr

P

Si

O^2-

Select from the list of particles to answer the following questions. A particle may be selected once, more than once or not at all.

i)

Which two ions have the same electronic structure?

[1]

ii)

Which ion has the same electronic structure as an atom of argon?

[1]

iii)

Which atom can form an ion of the type X^3–?

[1]

iv)

Which atom can form a hydride which has a formula of the type XH₄?

[1]

How did you do?

1b

4 marks

i)

How many protons, neutrons and electrons are there in one copper(II) ion

{}_{29}^{64}{Cu}^{2 +}

[2]

ii)

{}_{21}^{45}{Sc}

represents an atom of scandium.
How many nucleons and how many charged particles are there in one atom of scandium?

[2]

How did you do?

1c3 marks

Two different atoms of sodium are ${}_{11}^{23}{Na}$ and ${}_{11}^{24}{Na}$ .

i)

Explain why these two atoms are isotopes.

[2]

ii)

{}_{11}^{24}{Na}

is radioactive. It changes into an atom of a different element which has one more proton.
Identify this element.

[1]

How did you do?

Did this page help you?

1a4 marks

The table gives the composition of three particles.

particle	number of protons	number of electrons	number of neutrons
A	15	15	16
B	15	15	16
C	15	15	17

What is the evidence in the table for each of the following?

i)

Particle A is an atom.

[1]

ii)

A, B and C are all particles of the same element.

[1]

iii)

Particles A and C are isotopes of the same element.

[2]

How did you do?

1b2 marks

i)

What is the electronic structure of particle A?

[1]

ii)

Is element A, a metal or a non-metal? Give a reason for your choice.

[1]

How did you do?

Did this page help you?

	Download	View
Easy
Medium
Hard

particle	number of protons	number of electrons	number of neutrons	nucleon number	symbol or formula
A	6	6	6	12	C
B	11	10	12
C	8		8		O^2-
D		10		28	Al³⁺

shell	1st	2nd	3rd	4th
number of electrons

type of particle	relative charge	approximate relative mass
proton		1
neutron
electron	−1

name	symbol	relative mass	relative charge
electron
proton		1
	n		0

atom	number of protons	number of neutrons	number of electrons
${}_{31}^{69}{Ga}$
${}_{31}^{71}{Ga}$

	relative charge	relative mass
proton	+1
neutron		1
electron

particle	number of protons	number of neutrons	number of electrons
A	37	48	37
B	53	74	54
C	92	143	92
D	92	143	89
E	92	146	92
F	94	150	92

Atomic Structure & the Periodic Table (Cambridge O Level Chemistry)

Topic Questions