Question

the electron configurations of two unknown atoms are shown. based on the electron configuration of each atom, what is the number of valence electrons for each atom? electron configuration atom x atom y atom x = 1; atom y = 7 atom x = 1; atom y = 1 atom x = 11; atom y = 17 atom x = 10; atom y = 10

Explanation:

Step1: Recall the definition of valence electrons

Valence electrons are the electrons in the outermost shell of an atom.

Step2: Count the valence electrons for Atom X

Looking at the electron - configuration diagram for Atom X, the outermost shell has 1 electron.

Step3: Count the valence electrons for Atom Y

Looking at the electron - configuration diagram for Atom Y, the outermost shell has 7 electrons.

Answer:

Atom X = 1; Atom Y = 7 (the first option)