Atomic Structure - Checkpoint

A Greek philosopher suggested that everything was made up of tiny piece

• Atomicus

• Democritus

• Cactus

• Marcus

Democritus called his tiny pieces of matter ________ means "cannot be splitted"

• atom

• demo

• element

• electron

Below is not the three sub-atomic particles

• electron

• proton

• neutron

• megatron

The protons and neutrons are grouped closely together in the centre of the atom form ________

• electron

• element

• compund

• nucleus

Protons and neutrons have ___________ the electrons

• equal mass as

• less mass than

• much more mass than

• much less mass than

__________ have almost no mass

• proton

• neutron

• atom

• electron

Protons and neutrons have the same mass.

• true

• false

Protons have ________ electrical charge

• positive

• negative

• infinite

• neutral

Protons have ________ electrical charge

• positive

• negative

• infinite

• neutral

Electron have ________ electrical charge

• positive

• negative

• infinite

• neutral