Core electrons shield what from the pull of the nucleus?


A. Valence electrons
B. Neutrons
C. Protons

I think the answer is a

The nucleus contains what?

Positively charged protons and neutrons, so what is it likely to attract?

Therefore, what is shielded?

I think you may be on to something.

Yes, you are correct! Core electrons shield valence electrons from the pull of the nucleus. To derive this answer, let me explain.

In an atom, the nucleus contains positively charged protons and uncharged neutrons. These particles exert a strong attraction on negatively charged electrons, causing them to be pulled towards the nucleus. However, this attraction is not as strong for all electrons in the atom.

The core electrons, also known as inner shell electrons, are the electrons that occupy the inner electron shells closest to the nucleus. These electrons shield the valence electrons, which are the outermost electrons in the atom, from the full pull of the positively charged nucleus.

The shield effect of core electrons occurs due to their presence between the valence electrons and the nucleus. They essentially act as a barrier, reducing the electrostatic force of attraction between the positively charged nucleus and the negatively charged valence electrons.

Therefore, the correct answer is A. Core electrons shield valence electrons from the pull of the nucleus.