0973 02 Atoms, elements and compounds SUPPLEMENT 1

Front

Define atom

Back

The smallest part of an element that can still be recognised as that element

Front

Define element

Back

A substance made of only one type of atom

Front

State the three subatomic particles

Back

Protons, neutrons, electrons

Front

State the relative charges of the subatomic particles

Back

Protons: +1, neutrons: 0, electrons: -1

Front

State the relative masses of a proton, neutron and an electron.

Back

proton = 1, neutron = 1, electron = 1/1836.

Front

How are the subatomic particles arranged in an atom?

Back

Protons and neutrons in the nucleus, electrons orbiting in shells

Front

Where is almost all of the mass of an atom found?

Back

in its nucleus

Front

What is an atom’s mass number?

Back

The total number of protons + the total number of neutrons in an atom

Front

What is an atom’s atomic number?

Back

The number of protons in an atom

Front

How is the number of electrons in an atom related to its atomic number?

Back

The number of electrons in an atom is equal to its atomic number