1) Which two sub-particles in an atom have a mass of 1amu? a) protons and electrons b) neutrons and electrons c) protons and neutrons 2) To work out the mass of the whole atom you would add together the... a) the number of protons only b) the number of electrons and protons c) the number of protons and neutrons d) the number of neutrons and electrons 3) If an atom has 4 protons and 8 neutrons, its total mass would be... a) 4 amu b) 8 amu c) 12 amu d) 32 amu 4) If an atom has 20 protons and 17 neutrons, its total mass would be... a) 3 amu b) 17 amu c) 20 amu d) 37 amu 5) If an atom has 11 protons and a total mass of 23, how many neutrons must it have? a) 11 b) 12 c) 23 d) 34 6) If an atom has 9 neutrons and a total mass of 19, how many protons must it have? a) 9 b) 19 c) 28 d) 10 7) How many elements in this compound - H2O? a) 2 b) 3 c) 4 d) 6 8) How many atoms in this compound - H2O? a) 2 b) 3 c) 4 d) 6 9) How many elements in this compound - H2SO4 ? a) 2 b) 3 c) 4 d) 6 10) How many atoms in this compound - H2SO4 ? a) 2 b) 4 c) 6 d) 7

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