What is the basic building block of all matter?, electron shell, atom, chemical symbol, electrical charge, What is found in the centre of an atom?, chemical symbol, atomos, electron shell, nucleus, Which particle has a positive charge?, nucleus, neutron, proton, electron, Which particle has no electric charge?, neutron, electron, chemical element, proton, Which particle moves very fast around the nucleus?, electron, neutron, proton, calcium, Most atoms are electrically neutral because they have the same number of ______., nuclei and shells, electrons and neutrons, electrons and protons, protons and neutrons, What is a chemical element?, The centre of an atom, A substance that has only one type of atom, A region around the nucleus, A particle with a negative charge, What is a chemical symbol?, A small particle inside the nucleus, A special area around an electron, A positive or negative charge, One or two letters used to represent a chemical element, Which element has the chemical symbol O?, calcium, neon, oxygen, nitrogen, Which element has the chemical symbol Ca?, calcium, chlorine, oxygen, carbon
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