Question

an alkali metal in period 3 name it

Answer 1

potassium.......

or sodium........

Answer 2

The elements in the alkaline earth metals groups in period 3 are; beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra)

There are more answers but these are the ones that are the most obvious

I hope this helps you ^^