How many electrons would need to be added to fill the outermost energy level of hydrogen? of oxygen?

The diagrams show objects’ gravitational pull toward each other. which statement describes the relationship between diagram x and y? gravity attracts only larger objects toward one another. gravity attracts larger objects only if they are close to one another. if the masses of the objects increase, then the force between them also increases. if distance between the objects increases, then the amount of force also increases.

What is a metal replacement reaction

Asubstance is a good conductor of electricity which of the following best explains a probable position of the substance in a periodic table