According to the periodic table, which of the atoms above is a very reactive nonmetal? Select one:

A.
Atom A

B.
Atom B

C.
Atom C

D.
Atom D

Which sentence about particles in matter is true? a. atoms are present in solids and liquids but not in gases. b. the particles of matter are in constant motion. c. the same kinds of atoms are found in different elements. d. when a solid changes to a liquid, the sizes of the particles change.

The valence of aluminum is +3, and the valence of the chlorine is -1. the formula fir the aluminum chloride is correctly written as

What is the formula of the ionic compound composed of calcium cations and chloride anions