What trend does the first ionization energy follow, going across the periodic
table?
A. The ionization energy decreases because the atom size is
decreasing
B. The ionization energy increases because there are more protons
to pull on the electrons.
C. The ionization energy decreases because there are more valence
electrons.
D. The ionization energy increases because the atom is bigger.

Respuesta :

Answer:

B. The ionization energy increases because the ratio of the protons to electrons increases.

Explanation:

The first ionization energy of elements across the period increases because there are more protons  to pull on the electrons.

Ionization energy is the energy required to remove an electron from an atom. It is a periodic trend that increases across the period and decreases down the group.

The ionization energy decreases across the period as more protons are added and the size of the nuclear charge increases without a corresponding increase in the number of shells. As such more energy is required to remove a valence electron from the atom due to increased electrostatic interaction between the nucleus and the valence electrons.

Hence, the first ionization energy of elements across the period increases because there are more protons  to pull on the electrons.

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