Stuff

Question 1

Since the mass of an electron is negligible compared to the masses of a proton and neutron,
The mass of an atom is called

Answer 1

atomic mass

Question 2

• ——— is approximately equal to the mass number.

Answer 2

Atomic mass

Question 3

= In 1913, he assigned an atomic number to each element.

Answer 3

Henry Moseley (English, 1887-1915)

Question 4

The ——— of an element is also the number of protons of that element.

Answer 4

atomic number