A neutral isotope has 45 neutrons and 36 electrons. Identify the element symbol of this isotope and determine the mass number and number of protons.

Question

A neutral isotope has 45 neutrons and 36 electrons. Identify the element symbol of this isotope and determine the mass number and number of protons.

element symbol:?

mass number:?

number of protons:?

Answer 1

Recall:

protons + neutrons = atomic mass (mass number)

protons = electrons in a neutral atom

In the current problem:

neutrons = 45

electrons = 36

protons = 36

mass number = protons + neutrons = 36 + 45 = 81 = krypton

symbol = Kr