Question

which two elements have the same number of energy levels with electrons in them? (1 point) krypton and neon boron and oxygen lithium and francium neon and sodium

Explanation:

Elements in the same period of the periodic table have the same number of electron - filled energy levels. Boron (B) and oxygen (O) are both in the second period. Krypton is in the fourth period and neon is in the second period. Lithium is in the second period and francium is in the seventh period. Neon is in the second period and sodium is in the third period.

Answer:

B. boron and oxygen