Question

An element has atomic number 10 and an atomic mass of 20. How many neutrons are in the atom of this electron

Answer 1

Answer:

10 Neutrons

Explanation:

Atomic Mass = # of Protons + # of Neutrons

Atomic Number = # of Protons in nucleus and what element

20 = 10 protons + x # of neutrons

10 = x # of protons

Answer 2

Answer:

n = A - Z

n =  20 - 10

n = 10