Question

Which of the following among the given elements has highest value of Zeff in the outermost orbital?

Lithium

Hydrogen atom

Helium

Beryllium​

Answer 1

Answer:

not sure, but maybe Helium.

Answer 2

Hydrogen atom will have the highest value of Zeff in the outermost orbit.

• The effective nuclear charge or Zeff is the net positive charge that an electron experiences as an effect of the shielding effect offered by the other electrons in the atom that are present in the inner orbitals.
• The effective nuclear charge decreases down a group and increases across a period.
• Since hydrogen is present at the top of the group, hence it will have the highest value of effective nuclear charge.