Question

How would the composition of an atom change if both the atomic number and mass number each increase by one?

A) The atom would have 1 more neutron.
B) The atom would have one more proton and electron.
C) The atom would have one more proton and one more neutron.
D) The atom would have one more proton, one more neutron and one more electron.

Answer 1

If both the atomic number and mass number each increased by one, then ...

-- the atom would have one more proton in its nucleus,

and

-- whenever it was in a neutral state, it would also have one more electron in its cloud.

choice - B