1) The atomic number for an atom containing 20 protons, 21 neutrons, and electrons is……... a) 21 b) 41 c) 20 d) 61 2) The atomic number of an atom containing ...........protons, 10 neutrons, and 9 electrons. a) 9 b) 19 c) 29 d) 10 3) Chlorine has ........... protons in the nucleus. a) 35 b) 53 c) 17 d) 19 4) The atomic number of chlorine is........... a) 35 b) 53 c) 17 d) 19 5) The mass number of chlorine is........... a) 35 b) 53 c) 17 d) 19 6) The atomic number of sulphur is............ a) 48 b) 16 c) 15 d) 32 7) The mass number of aluminium is 27, and the number of protons is 13 and the number of neutrons is......... a) 14 b) 40 c) 13 d) 26 8) The number of protons is 16 and the number of electrons is.......... a) 64 b) 32 c) 48 d) 16 9) The atomic number is 20 and the number of neutrons is............ a) 60 b) 20 c) 19 d) 40 10) How many electrons does calcium have? a) 60 b) 20 c) 19 d) 40

Atomic numbers and Atomic Masses (Atomic Number = no. of protons; Mass = no. of protons + neutrons.

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