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,

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