9. Complete the following chart: Mass # of protons 35 Element Atomic symbol number number Br 80 Zh Pb 我 Hg 0-2² AI+3 2 P-³ K* 35 30 82 44 8 13 15 19 65 207 128 198 90 16 27 31 30 39 82 55 8 13 15 # of neutrons 45 35 35 19 125 58 78 8 14 # of electrons 10 20 52 39 10 13 18 19 Hyphen Notation Bromine- Bo Zn-65 Pb-207 Nuclear Notation OXYsen -16 80 35 Br 207 aluminum-27 Phosphorus-31 Potassium-39 82fb 16 80 27 13 31 15 39 AI P 19 C

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Mole Concept

Mole concept is a method to determine the amount of any substance that consists of some elemental particles using a grouping unit called ‘mole’. The mole concept enables one to handle the large amount of small elementary particles. The mole concept can be used in many calculations related to mole calculation, molar amount, mole ratio, and so on, which are significant in chemistry.