1) What is the mass number of element Ca? a) 40.1 b) 40.078 c) 40 2) What is the mass number of Silicon? a) 28.085 b) 28.07 c) 28.10 3) What is the mass number of Copper? a) 63.546 b) 63.55 c) 63.56 4) What is the mass number of Phosphorus? a) 31.0 b) 30.974 c) 31.98 5) What is the mass number of Silver? a) 107.87 b) 107.86 c) 107.868

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