Atoms ions isotopes

Question 1

atomic and mass number

Answer 1

the mass number = total no. of protons and neutrons
atomic number+ no. of protons

Question 2

more on atoms

Answer 2

atoms of the same element all have the same no. of protons- so atoms of different elements will have different numbers of protons.
neutral atoms have no charge overall as they have the same no. of protons as electrons, their charges cancel each other out.

Question 3

ions

Answer 3

ions form when electrons gain or lose electrons
negative ions gain electrons- more electrons than protons
positive ions lose electrons- more protons than electrons

Question 4

isotopes

Answer 4

have the same atomic no. but different mass numbers. if they had different atomic numbers they’d be different elements