10 points
4. The atomic number of krypton is 36. If the mass number of krypton is
84, which answer choice shows the number of subatomic particles inside
and outside the nucleus of the krypton atom?
O
inside nucleus= 36 outside nucleus= 36
O
inside nucleus=36 outside nucleus=48
inside nucleus= 84 outside nucleus= 36
O
inside nucleus= 84 outside nucleus= 48

The number of subatomic particles inside and outside the nucleus of the krypton atom is as follows: inside nucleus= 84 outside nucleus= 36.

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inside nucleus= 84 outside nucleus= 36

Explanation:

Recall that an atom is made up of three subatomic particles named protons, neutrons and electrons. The proton and neutrons are found inside the nucleus while electrons are found outside the atom nucleus.

So, given that:

Atomic number of krypton = 36

Mass number of krypton = 84

The number of protons = 36 (same as atomic number)

The number of neutrons = (Mass number - Number of protons) 84 - 36 = 48

Thus, particles inside nucleus = (protons + neutrons) = 84

While particles (electrons) outside nucleus = 36 (same as the atomic number which is 36).

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