Potassium (K) and copper (Cu) are both in period 4. They both have . four electron shells
similar properties
the same number of electrons
the same number of protons

Free answer. the treaty of versailles ended world war i, but some of the terms of the treaty contributed to the beginning of world war ii. which was one of the terms of the treaty? the answer would be "germany was forces to pay reparations to the allied countries.". i hope this .

The volume of an unknown substance in a sealed glass jar is 50 milliliters. the volume of the jar is 200 milliliters. which state of matter could the substance be?

Concentrations expressed as a percent by mass are useful when the solute is a a. liquid b. gas c. solid