In the illustration below,the part of the atom in which virtually all the mass is concentrated is referred to as the:
A)first electron energy level.
B)second electron energy level.
C)Both A and B are correct.
D)nucleus.

Question

In the illustration below,the part of the atom in which virtually all the mass is concentrated is referred to as the: 
A)first electron energy level. 
B)second electron energy level. 
C)Both A and B are correct. 
D)nucleus.

Quizplus · Accepted Answer

The part of the atom in which virtually all the mass is concentrated is the nucleus. This is where protons and neutrons are located. Option A and B are incorrect as they refer to electron energy levels, which are shells outside the nucleus and contain electrons, making it a negligible mass.

In the Illustration Below,the Part of the Atom in Which