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A-Level CAIE Chemistry AS1.1 Particles in the atom and atomic radiusQuestion Bank

(a)

P-T are successive elements in Period 3 of the Periodic Table.

The letters are not the symbols of the elements.
On the axes, sketch a graph to show the trend in the atomic radius of the elements P-T.
Explain your answer.

Question image

explanation

[ 3 ]
[Maximum number: 1]

In which pair do the atoms contain the same number of neutrons?

A

11 B{ }^{11} \mathrm{~B} and 12C{ }^{12} \mathrm{C}

B

7Li{ }^{7} \mathrm{Li} and 9Be{ }^{9} \mathrm{Be}

C

24Mg{ }^{24} \mathrm{Mg} and 28Si{ }^{28} \mathrm{Si}

D

14 N{ }^{14} \mathrm{~N} and 16O{ }^{16} \mathrm{O}

[Maximum number: 1]

The ion Y3−Y^{3-} contains 18 electrons and has a mass number of 31.
How many protons and neutrons does Y3−Y^{3-} contain?

protons

neutrons

15

16

15

18

18

13

21

10

[Maximum number: 1]

In which species are the numbers of protons, neutrons and electrons all different?

A

919 F−{ }_{9}^{19} \mathrm{~F}^{-}

B

1123Na+{ }_{11}^{23} \mathrm{Na}^{+}

C

1531P{ }_{15}^{31} \mathrm{P}

D

1632 S2−{ }_{16}^{32} \mathrm{~S}^{2-}

[Maximum number: 1]

Use of the Data Booklet is relevant to this question.
In which option do all three particles have the same electronic configuration and the same number of neutrons?

A

15 N3−16O2−19 F−{ }^{15} \mathrm{~N}^{3-} \quad{ }^{16} \mathrm{O}^{2-} \quad{ }^{19} \mathrm{~F}^{-}

B

18O2−19 F−20Ne{ }^{18} \mathrm{O}^{2-} \quad{ }^{19} \mathrm{~F}^{-} \quad{ }^{20} \mathrm{Ne}

C

19 F−20Ne23Na+{ }^{19} \mathrm{~F}^{-} \quad{ }^{20} \mathrm{Ne} \quad{ }^{23} \mathrm{Na}^{+}

D

22Ne23Na24Mg2+{ }^{22} \mathrm{Ne} \quad{ }^{23} \mathrm{Na} \quad{ }^{24} \mathrm{Mg}^{2+}

(a)

（a）Complete Table 1.1 using relevant information from the Periodic Table．

Table 1.1

Table 1.1

[ 2 ]
(b)

（b）State and explain the difference in the ionic radius of Al3+\mathrm{Al}^{3+} compared to Mg2+\mathrm{Mg}^{2+} ．

[ 3 ]
[Maximum number: 2]

The elements phosphorus, sulfur and chlorine are in Period 3 of the Periodic Table.

Table 1.1 shows some properties of the elements P to Cl .
The first ionisation energy of S is not shown.

Table 1.1

Table 1.1

(a)

P3−,S2−\mathrm{P}^{3-}, \mathrm{S}^{2-} and Cl−\mathrm{Cl}^{-}have the same number of electrons.

[ 2 ]
(i)

State the trend in ionic radius shown by P3−,S2−\mathrm{P}^{3-}, \mathrm{S}^{2-} and Cl−\mathrm{Cl}^{-}.

Explain your answer.

[ 2 ]
[Maximum number: 2]

Atoms with nuclei containing an odd number of protons tend to have fewer isotopes than those with an even number of protons.

(a)

Gallium has two stable isotopes, 69Ga{ }^{69} \mathrm{Ga} and 71Ga{ }^{71} \mathrm{Ga}.

[ 2 ]
(i)

Complete Table 1.1 to show the numbers of protons, neutrons and electrons in the two stable isotopes of gallium.

Table 1.1

Table 1.1

[ 2 ]
[Maximum number: 3]

Species such as NH4+,CO32−\mathrm{NH}_{4}{ }^{+}, \mathrm{CO}_{3}{ }^{2-} and PO43−\mathrm{PO}_{4}{ }^{3-} are examples of molecular ions.

(a)

Complete Table 1.1 to show the total numbers of protons and electrons in the molecular ions NH4+,CO32−\mathrm{NH}_{4}{ }^{+}, \mathrm{CO}_{3}{ }^{2-} and PO43−\mathrm{PO}_{4}{ }^{3-}.

Table 1.1

Table 1.1

[ 3 ]
[Maximum number: 2]

Atoms contain the subatomic particles electrons, protons and neutrons. Protons and electrons were discovered by observations of their behaviours in electric fields.

(a)

The diagram shows the behaviour of separate beams of electrons and protons in an electric field.

Question image
[ 2 ]
(i)

Complete the diagram with the relative charge of each of the electrically charged plates.

[ 1 ]
(ii)

On the diagram, draw a line to show how a separate beam of neutrons from the same source behaves in the same electric field.

[ 1 ]
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