type the correct answer in the box. use numerals instead of words. a certain radioactive atom has 90 protons…

type the correct answer in the box. use numerals instead of words. a certain radioactive atom has 90 protons and 142 neutrons. if this atom undergoes alpha decay, what is the mass number of the daughter atom? the mass number of the daughter atom is

type the correct answer in the box. use numerals instead of words. a certain radioactive atom has 90 protons and 142 neutrons. if this atom undergoes alpha decay, what is the mass number of the daughter atom? the mass number of the daughter atom is

Answer

Answer:

230

Explanation:

Step1: Calculate original mass number

Mass number = Protons + Neutrons = 90 + 142 = 232

Step2: Understand alpha - decay

An alpha - particle is a helium nucleus with mass number 4.

Step3: Calculate mass number of daughter atom

Daughter atom mass number = Original mass number - 4 = 232 - 2 = 230