Fundamentals of Chemistry

The relative charge of a proton is +2.

• True

• False

What is the object at the centre of an atom called?

• Nucleus

• Proton

• Neutron

• Centreolus

What two particles make up a nucleus?

• Protons

• Electrons

• Neutrons

• Atoms

Where are electrons found in the atom?

• In shells around the nucleus

• In the nucleus

• In shells outside the atom

• In shells in the nucleus

What is the relative mass of a neutron?

• 0

• 1

• -1

The atomic number of an element tells us...

• How many protons it contains

• How many neutrons it contains

The mass number of an element tells us...

• How many protons it contains

• How many neutrons it contains

• The number of protons added to the number of neutrons

• How many electrons it contains

How many neutrons are there in an atom of sodium?

• 11

• 23

• 12

• 34

What is an isotope?

• An element with a different number of protons and neutrons

• An element with a different number of protons and electrons

• A different form of an element, with the same number of protons, but a different number of neutrons

• An element with an odd number of neutrons

Tick the three correct features of the plum pudding model.

• No nucleus

• Nucleus in the centre

• Electrons in shells

• Positive "soup"

• Electrons randomly spread throughout