AQA GCSE Physics 4.4 Atomic structure overview quiz quiz

$+1$

$-1$

$+2$

$0$

The positive charge and mass are concentrated in a small nucleus

The electrons are all packed tightly together inside the central nucleus

Atoms are solid throughout

The atom has no nucleus

The Bohr model

The plum pudding model

The quark model

The electron cloud model

Atoms of two different elements that share the same mass number

Atoms that have lost electrons

Atoms of the same element with different numbers of neutrons

Atoms with different numbers of protons

$11$

$12$

$23$

$34$

Beta

Gamma

Neutron

Alpha

It increases by $1$

It decreases by $2$

It stays the same

It decreases by $1$

The time for the source to decay completely

Half the age of the source

The time for the activity to halve

The time for the source to become twice as active

$400\,Bq$

$200\,Bq$

$50\,Bq$

$100\,Bq$

Contamination is having radioactive atoms on or in an object; irradiation is exposure to radiation from a source

They are the same thing

Contamination only involves gamma rays

Irradiation always makes the exposed object permanently radioactive, whereas contamination never has any effect at all

Two light nuclei join together to form one single heavier nucleus

A large unstable nucleus splits into two smaller nuclei

An electron is emitted from the nucleus

A nucleus gains a neutron without changing

To melt the nuclei

To slow the moving nuclei right down so they can join together gently

To overcome the repulsion between the positively charged nuclei

To split the nuclei apart