a bright silver and white coloring. similar electron configurations. strong radioactive properties. few or no stable isotopes.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Strontium, barium, and radium are grouped together on the Periodic Table of the Elements because they all have
Possibilities:
- a bright silver and white coloring.
- similar electron configurations.
- strong radioactive properties.
- few or no stable isotopes.

similar electron configurations.