Question

Use the periodic table to identify the number of core electrons and the number of valence electrons in each case below.

Potassium (K): 1s22s22p63s23p64s1
18 core electrons
1 valence electrons

Iron (Fe): [Ar]4s23d6
18 core electrons
8 valence electrons

Argon (Ar): [Ne]3s23p6
10 core electrons
8 valence electrons

Magnesium (Mg): 1s22s22p63s2
10 core electrons
2 valence electrons

Answer 1

Yes,your answers are absolutely right/correct!

More to know:

What is valence?

• Another term for valence is valency.
• It is the number of electrons needed to fill the outer most part of an atom.

What is core electrons?

• They are the electrons of an atom.
• They don't take part in chemical bonding.

Answer 2

Yes your answers are correct.

Let's know about valence and core electrons

• The electrons which are present in outer most cell of an atom called valence.
• The atoms which are present inert cells of an atom is called core electrons.