CAIE A-Level Chemistry AS 1.1 Particles in the Atom and Atomic Radius Questions

Practise describing atomic particles, calculating particle numbers and explaining radius trends from nuclear charge and shielding.

Exam points

use proton and nucleon numbers with ionic charge to determine protons, neutrons and electrons
compare particle mass and charge to predict deflection in an electric field at equal velocity
explain radius trends using shell number, shielding, nuclear charge and attraction to outer electrons

Covered syllabus points

1.1.1—Atomic structure and nucleus 1.1.2—Protons, neutrons and electrons 1.1.3—Terms: atomic and proton number, mass 1.1.4—Distribution of mass and charge within an atom 1.1.5—Behaviour of beams of protons, neutrons 1.1.6—Determine the numbers of protons, neutrons 1.1.7—Trends: the variations in atomic radius

[Maximum number: 1]

Neutrons are passed through an electric field. The mass of one neutron relative to $\frac{1}{12}$ the mass of a ${ }^{12} \mathrm{C}$ atom and any deflection in the electric field is recorded.

Which row is correct?

mass of

neutron

behaviour of beam of

neutrons in an electric field

deflected

not deflected

[Maximum number: 1]

Beams of charged particles are deflected by an electrical field. The angle of deflection of a particle is proportional to its charge/mass ratio.

In an experiment protons are deflected by an angle of $+15^{\circ}$ . In another experiment under identical conditions ${ }^{2} \mathrm{H}^{-}$ ions are deflected by an angle of $\mathrm{Y}^{\circ}$ .

What is the value of Y?

-30.0

-7.5

+7.5

+30.0

[Maximum number: 1]

Which statement about ${ }_{53}^{131} \mathrm{I}$ is correct?

A negative ion of ${ }_{53}^{131} \mathrm{I}$ contains 53 neutrons and 52 electrons.

A negative ion of ${ }_{53}^{131} \mathrm{I}$ contains 53 neutrons and 54 electrons.

A negative ion of ${ }_{53}^{131} \mathrm{I}$ contains 78 neutrons and 52 electrons.

A negative ion of ${ }_{53}^{131} \mathrm{I}$ contains 78 neutrons and 54 electrons.

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Covered syllabus points

Question 1

Question 2

Question 3