Which of the answer choices is a true statement? Select all that apply.

Nonmetals usually exist as molecules, combining with atoms of themselves.

Metallic elements usually exist as molecules, combining with atoms of themselves.

Nonmetals can exist on their own as individual atoms.

Metallic elements can exist on their own as individual atoms.

The direction of the current in an alternating current circuit remains constant. is direct. changes repeatedly. changes randomly.

What is the state of matter with a specific volume but no definite shape

If a small-diameter open glass tube is partially immersed in a vessel containing mercury, the surface of the mercury inside the tube will be a. lower than the mercury in the vessel, and shaped like the inside of a bowl. b. higher than the mercury in the vessel, and shaped like the inside of a bowl. c. lower than the mercury in the vessel, and shaped like the outside of an umbrella. d. higher than the mercury in the vessel, and shaped like the outside of an umbrella.