Question

Which is true about each element in a period or horizontal row of the periodic table?

A.
Each element has one more outer shell than the element before it.


B.
Each element has one more outer electron than the element before it.


C.
Each element has one more isotope than the element before it.


D.
Each element bonds with the element before it.

Answer 1

The answer is B as going from left to right on the periodic table elements increase by 1 in valence electrons

Valence electrons : The electrons on the outermost shell