Question

identify the correct elements being described below: the lightest noble gas. transition metal in period 4. the alkaline earth metal with the greatest mass. answer bank helium he radium ra copper cu

Explanation:

Step1: Identify lightest noble gas

The lightest noble gas is helium (He) as noble - gases are in group 18 of the periodic table and helium has the lowest atomic number among them.

Step2: Identify transition metal in period 4

Copper (Cu) is a transition metal in period 4. Transition metals are in groups 3 - 12 and copper is in period 4.

Step3: Identify alkaline - earth metal with greatest mass

Radium (Ra) is an alkaline - earth metal (group 2) and has a relatively large atomic mass compared to other alkaline - earth metals.

Answer:

The lightest noble gas: He, Transition Metal in Period 4: Cu, Alkaline Earth Metal with the greatest mass: Ra