Atomic mass and number

What charge do electrons have

Negative charge

What charge do neutrons have

A neutral charge

Why do atoms have no overall charge

Because the number of electrons is the same as the number of protons

What does the atomic number tell us

The number of protons in the atoms of that element

What does the mass number tell us

The number of protons and neutrons added together

How do we work out the number of neutrons

We need to subtract the atomic number from the mass number

What do all atoms of the same element have

The same number of protons

what are isotopes

Atoms of the same element with numbers of neutrons

What are ions

Atoms which have an overall charge Because ions have lost or gained electrons

What have positive ions lost

Electrons

What have negitive ions gained

Negative ions have gained an electron