Allotropes - Different structural versions of the same element, Isotopes - Different versions of the same atom; varying in neutron number, Diamond - Each carbon atom forms 4 covalent bonds, Graphite - This has a layered structure, Protons - Positively charged subatomic particle, Group 1 - Reactivity increases moving down this group, Group 7 - Reactivity decreases moving down this group, Covalent bonding - The sharing of electrons between non metal atoms, Metallic bonding - Electrostatic forces of attraction between metal ions and delocalised electrons, Simple covalent molecules have.... - ...relatively low melting and boiling points, Giant covalent structures have... - ...relatively high melting and boiling points,

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