What is the term for two or more different atomic nuclei with the same mass number but different atomic numbers?

Which term describes elements with the same number of protons but different numbers of neutrons?

Which subatomic particle was discovered by J.J. Thomson?

What is the name of the smallest unit of a compound that retains its chemical properties?

Who proposed the nuclear model of the atom based on the gold foil experiment?

Which term refers to an atom's tendency to attract shared electrons in a bond?

Which scientist proposed that electrons orbit the nucleus in fixed energy levels?

What is electron affinity?

What did John Dalton propose about atoms?

What is the term for the energy required to remove an electron from a gaseous atom?

What is the term for a positively charged ion?