Question

In the symbol 42He, the subscript 2 is the _____ for helium and the superscript 4 is the _____ for helium. Question 10 options: atomic mass; atomic number atomic number; atomic mass mass number; atomic number atomic number; mass number

Answer 1

mass number; atomic number

Answer 2

The correct answers for this problem is:

atomic number; atomic mass

Atomic number indicates the number of protons or electrons that is located in that atom. Helium contains 2 protons or electrons hence an atomic number of 2. Meanwhile the atomic mass of 4 indicates the mass of the atom per mole.