The atomic mass of an element is 32.07 u and its atomic number is 16. the number of protons contained in the nucleus of an atom of this element is
(a) 16
(b) 31
(c) 32
(d) 48

I THINK IT IS 16 BECAUSE THE ATOMIC NUMBER AND THE NUMBER OF PROTONS ARE THE SAME

Atomic number = number of electrons = number of protons( by JJ thomson's theory)

Thus, the number of protons is 16

If a hydrogen atom is neutral, it must also have  one electron. an oxygen atom (o) has an atomic number of eight (8). this means a neutral oxygen atom has eight protons and eight electrons. the element actium (ac) has an atomic number of 89, so it has 89 protons and 89 electrons in a neutral atom