Question

Which of the following places the elements in the correct order of increasing first ionization energy?

Ca, Mg, Be

F, O, N

Li, Na, K

Si, P, S

Answer 1

Ionization energy increases on the periodic table from left to right, and from bottom to top. Follow that trend and you'll have your answer.

Answer 2

ca<mg<be
is the correct
in F O N correct order is O<N<F
in Li Na K- K<Na<Li
in Si P S - Si<S<P