Easy elements in the same period have similar properties the same number of protons the same number of electron shells the same number of electrons

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.

How many grams of mgbr2 are needed to produce 75g or metal?

What are the two largest greenhouse gases