Question

Which among the following is/are correct order of first ionisation energy?
i) Ag > Cu > Au
ii) SC > Y > La
iii) Pd < Pt < Ni
iv) Al <Ga<B
1) i only
2) i and ini
3) ii and iv
4) il, ili and iv

please help me
no spams​

Answer 1

Answer:

Correct order of ionisation energies are Sc > Y > La

Explanation:

• The lowest energy necessary to remove the most loosely attached electron of an isolated gaseous atom, ion, or molecule is known as ionisation energy.

• An electron's ionisation energy increases with atomic number and decreases for higher energy orbitals.

• As we go from left to right through the periodic table, the ionisation energy increases owing to decreasing atomic radius.

• The ionisation energy drops as we proceed from top to bottom. This is mostly due to the existence of additional electron shells as we proceed down the group.

• Furthermore, the electrons are positioned further away from the nucleus's attractive forces.

• Order of ionisation energy is Sc > Y > La because as we move down in a group the ionisation energy of the elements decreases and Sc belongs to 4th period Y belongs to 5th period and La belongs to 6th period. They all belongs to 3rd group in modern periodic table.

Hence the Sc > Y > La is the correct of order of ionisation energies only.

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