Correct: Protons have a mass of 1, Atomic number is number of protons, Atoms have equal numbers of protons and electrons, Electrons have a very small mass, Electrons have a charge of -1, Protons have a charge of +1, Neutrons have a charge of 0., Mass number is number of protons plus neutrons, The first shell holds a maximum of 2 electrons, The centre of the atom is called the nucleus, The centre of an atom contains protons and neutrons, The second shell holds a maximum of 8 electrons, Isotopes have different numbers of neutrons, Neutrons have a mass of 1, The nucleus of an atom is very small compared to the rest of the atom, Incorrect: Electrons have a mass of 1, Atomic number is number of neutrons, Atoms have equal numbers of electrons and neutrons, Neutrons have a charge of -1, Neutrons have a mass of 0, Mass number is number of electrons and neutrons, The first shell holds a maximum of 2 protons, The centre of the atom is called the neutron, The centre of the atom contains electrons and neutrons., Isotopes are different elements, The nucleus of an atom is massive,

Atomic Structure

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