Which two elements have the same number of valence electrons?

Na and Sr

Zr and H

O and S

Mg and P

What is the most important reason for using hydrates in fire extinguishers?

When methane is burned with oxygen the products are carbon dioxide and water. if you produce 36 grams of water and 44 grams of carbon dioxide from 16 grams of methane, how many grams of oxygen were needed for the reaction?

Is there DNA in food? and how would you know?

What kind of physical variables can we test water for?

Is kingdom more specific taxon than family?

Nonrenewable energy resources include what types of energy?

Why can we only see water vapor right above the boiling water

What does this symbol, 1/0N, mean? A. an electron of negligible mass and one unit of charge B. a position of negligible mass and one unit positive charge C. a neutron of zero mass and one unit positive charge D.

What is a characteristic of every combination reaction?

What is the change of a liquid to a solid, 15 letter word, 4th letter is "s".