Question

identify the correct elements being described below: the alkaline earth metal with the greatest mass. transition metal in period 4. the lightest noble gas.

Explanation:

Step1: Identify alkaline - earth metals

Alkaline - earth metals are in group 2 of the periodic table. Ra (Radium) is an alkaline - earth metal and has a relatively large atomic mass among them.

Step2: Identify period 4 transition metals

Cu (Copper) is a transition metal in period 4 of the periodic table.

Step3: Identify noble gases

He (Helium) is the lightest noble gas.

Answer:

1. Ra
2. Cu
3. He