Question

analysis questions:

1. using attraction, briefly explain why the electron shells closest to the nucleus fill up first.

Explanation:

Electrons are negatively charged and the nucleus is positively charged. The closer an electron shell is to the nucleus, the stronger the electrostatic attraction between the electrons in that shell and the nucleus. Electrons occupy the shells with the strongest attraction first, which are the shells closest to the nucleus.

Answer:

Electrons fill the shells closest to the nucleus first because the electrostatic attraction between the negatively - charged electrons and the positively - charged nucleus is strongest for these shells.