Atom structure

Question 1

What is the mass number?

Answer 1

Protons + neutrons in the atom

Question 2

What is the atomic number?

Answer 2

Number of protons in an atom

Question 3

²³Na How many neutrons does sodium have

¹¹

Answer 3

12 neutrons

Question 4

What is an isotope?

Answer 4

Isotopes are different forms of the same element which have the same number of protons but a different number of neutrons.