STRUCTURE OF ATOMS 2 Atom Atomic number Mass number 9 19 Number of protons Number of neutrons Number of electrons !" !C !" !"Cl F Kr 84 B 36 5 Al 5 14 13 !"# !"Au Br 35 44 !" !N !" !"P Li 3 Ne 10 Ca 7 10 40 20 Be Cl 5 17 18 W 110 U Mo 4 92 42 Fe © www.CHEMSHEETS.co.uk 146 96 56 Ni I 74 26 28 127 30 53 01-January-2016 Chemsheets GCSE 1002