Compare the electron configurations of hydrogen, lithium, and sodium. why do you think these elements are grouped in the same family?

they all have the same amount if valance electrons

Explanation:

hydrogen has an electron configuration of 1.

lithium has 2-1

sodium has 2-8-1

their valance electrons on the outer shell all have 1 electron, which is why they are grouped in the same family

explanation:

crosscutting concepts have application across all domains of science. as such, they are a way of linking the different domains of science. they include patterns; cause and effect; scale, proportion, and quantity; systems and system models; energy and matter; structure and function; and stability and change.

2b2t

explanation:

2b2t