Atoms

The atomic number...

• decreases across a period

• increases across a period

• decreases down a group

• increases down a group

The atomic numbers gives...

• the number of protons

• the number of neutrons

• the number of electrons

• the number of protons and neutrons

An atom is neutral because...

• of the neutrons

• the negative protons cancel the positive electrons

• the negative electrons cancel the positive protons

• protons have no charge

A neutron has a mass of

• 1u

• -1u

• 0u

• 2u

An electron has a charge of

• +1

• 0

• -1

• 2

Elements are made up of

• compounds

• stars

• hydrogen

• atoms

Protons are found

• outside the nucleus

• in an orbit

• inside the nucleus

• in space

If Lead has 82 electrons, how many protons has it got?

• 0

• 41

• cannot work it out

• 82

Why are calcium and barium similar?

• they are in the same group

• they are in the same period

• they have the same number of electrons

• they have similar sounding names

Which element is the odd one out?

• Potassium

• Gold

• Arsenic

• Mercury