Define ionisation energy.

Define ionization energy. Name the factors on which ionisation energy depends? How does it vary down the group and across a period?

If first ionisation energy of hydrogen be E , then the ionisation energy of He^+ would be :

The first ionisation energy is maximum for

The first ionisation energy is maximum for

The first ionisation energy of the Be is greater than that of B but the second ionisation energy of Be is less than that of B. explain.

The first ionisation energy of magnesium is greater than that of sodium, whereas the reverse is true for second ionisation energy. Explain.

Why the first ionisation energy of carbon atom is greater than that of boron atom whereas, the reverse is true for the second ionisation energy.