INVESTIGATION OF WHETHER THE AMOUNT OF MAGNESIUM USED AFFECTS THE AMOUNT OF HYDROGEN PRODUCED IN THE REACTION WITH AN ACID. There is a nucleus at the centre of every atom containing one or more protons and neutrons, with one or more electrons forming a 'shell' or shells around it. Electrons are arranged around the nucleus in energy levels or shells. Atoms of different elements have different numbers of electrons in each shell, and may have different numbers of shells. The mass of an atom is due to that of the protons and neutrons in the nucleus. The Atomic number is the number of protons in the nucleus of an atom. In a periodic table, the elements are arranged in periods and groups. The elements are also arranged in increasing atomic number. For example, Chlorine is in group 7, so it forms single charged negative ions, Cl- because it is one electron short of a noble gas electron structure. So when chloride wants to react, it forms covalent compounds with non-metals and with themselves. The bonding in the molecule involves single covalent bonds e.g. with hydrogen, it forms hy......

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