The modern periodic table has groups. (Write your answer as a number.)

It has 18 groups

Explanation:

The modern periodic table that we use today, has 18 groups. The elements in each group have both the same or similar chemical properties and physical properties due to their having the same amount of valence electrons.

image result for how many calories of energy will 20 grams of carbohydrates provide in one gram provides 4 calories

consuming the right balance of protein, carbohydrates and fat can you maintain a healthy weight and optimize your energy levels. protein and carbohydrates both contain 4 calories per gram, while fat provides 9 calories per gram.