Question

How Many Protons (P) And Neutrons (N) Are In An Atom Of Calcium-46?

(a) 20 P, 26 N
(b) 26 P, 20 N
(c) 46 P, 20 N
(d) 20 P, 46 N

Answer 1

a

Step-by-step explanation:

Mass number = No of protons + No of neutrons

Atomic number = No of protons

Mass number = 46 (from question)

Atomic number of Ca = 20

therefore:

46 = 20 + no of neutrons

no of neutrons = 26