1.) how many periods are on the periodic table? are periods the columns or the rows on the periodic table?

How do forces between particles in gases compare to forces in the other states of matter? o a. the forces in gases are stronger than forces in solids but weaker than forces in liquids. o b. the forces in gases are weaker than forces in solids but stronger than forces in liquids. o c. the forces in gases are weaker than forces in solids and liquids. o d. the forces in gases are stronger than forces in solids and liquids. submit

What is the ph of a solution that has a hydrogen ion concentration of 1.0 * 10 -9 m?

Ab c or d ? i’m not sure what the answer is