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

Iknow the answer is a but i don't know why

The number of moles of a given mass of a substance can be found without knowing its molecular formula or molar mass. true false

Which conclusion fits the data in the table? a. heat chemically changes chocolate and margarine. b. all solids become liquid at 100°f. c. removing heat from a substance it to melt. d. matter may change shape when it is heated.