Question

The electron configurations of two unknown atoms are shown.

Electron Configuration
Based on the electron configuration of each atom, what is the number of valence electrons for each atom?
a Atom X = 1; Atom Y = 1
b Atom X = 1; Atom Y = 7
c Atom X = 10; Atom Y = 10
d Atom X = 11; Atom Y = 17

Answer 1

Atom X has 1 valence electron and Atom Y has 7 valence electrons.

Step-by-step explanation:

The electron configuration of an atom tells us how the electrons are distributed in the different energy levels or orbitals. To determine the number of valence electrons, we look at the outermost energy level of the atom's electron configuration. For atom X, the electron configuration is 1, so it has 1 valence electron. For atom Y, the electron configuration is 7, so it also has 7 valence electrons.

Answer 2

b Atom X = 1; Atom Y = 7

Step-by-step explanation:

a valence electron is an electron in the outer shell

So X has 1 in outer shell

Y has 7 in outer shell