Can Some1 help?? When using the "ball and stick" drawing method of drawing a compound, which element usually goes in the center of the model?

If a substance is in the gas phase, which of qualities of the gas will stay constant? a: volume b: mass c: shape d: position of particles

The movement of electrons between atoms is called an

Acold front traveling southeast collided with a warm front traveling northwest the following map shows the weather on monday the day the two fronts collided which of these describes the weather forecast for mississippi on tuesday and wednesday