Question

12 multiple choice 1 point select the atom with the highest ionization energy. ra sr ca be

Explanation:

Ionization energy increases across a period and decreases down a group in the periodic table. Ra (Radium), Sr (Strontium), Ca (Calcium), and Be (Beryllium) are all in Group 2 (alkaline - earth metals). Be is the highest up in the group among them, so it has the highest ionization energy due to its smaller atomic radius and stronger attraction between the nucleus and the out - most electrons.

Answer:

Be