Answer:
PERIODS
Explanation:
As with any grid, the periodic table has rows running left to right, and columns running up and down. The rows are called PERIODS and the columns are called GROUPS.
D,it never acceptable to ignore rules or etiquette but A, when no one else notices you ignored the rules.
<span>Body mass index (BMI) is a measure of body fat based on height and weight that applies to adult men and women.</span>