Question

3. The 2 in 1s2 represents the number of

located in that energy level.
Answers:
electrons
protons

Answer 1

electrons

Step-by-step explanation:

In an atom, you can have varying numbers of electrons, depending on if its an ion or not. You can use the orbitals to see the energy level of the atom.

An atom has only one number of protons. The number of protons cannot vary.