Question

For which of the following elements is the number of neutrons correctly represented, based on the atomic number and mass number given? A. iron: atomic number 26, mass 56, neutrons 30 B. neon: atomic number 10, mass 20, neutrons 9 C. potassium: atomic number 19, mass 39, neutrons 19 D. phosphorus: atomic number 15, mass 31, neutrons 15

Answer 1

Answer: A. iron: atomic number 26, mass 56, neutrons 30

Step-by-step explanation:

Atomic number = proton = 26

Mass number = 56

Mass number = proton + Neutron

56 = 26 + Neutron

Neutron = 56 - 26

Neutron = 30