Question

What is ionisation energy?

Answer 1

See the explanation

Explanation:

Ionization energy is the energy required to remove one electron from an atom of an element in an isolated gaseous state.

Ionization energy always increases ,i.e., second ionization energy is always greater than the first ionization energy.

Mathematically,

`IP_1 < IP_2 < IP_3 < IP_4` and so on.

Answer 2

The is the energy required to produce one mole of gaseous cations...

Explanation:

The is the energy required to produce one mole of gaseous cations, and one mole of gaseous electrons, from one mole of gaseous element....i.e.

`M(g) + DeltaH_"ionization"^@ rarr M^+(g) + e^(-)`

These are extensively tabulated....and, reasonably, `DeltaH_"ionization"^@` increases across the Period from left to right as we face the Table, and decreases down a Group.

Answer 3

Ionization energy: Minimum amount of energy required to remove an electron from isolated gaseous atom is called ionization energy of that element.

Explanation:

`Na (g) = Na^+ (g) + 1 e^-`
Minimum energy required for this process `= 1251.1` KJ/mol
So, ionization energy of Na atom is `1251.1` KJ/mol