An incomplete form of the periodic table is given below. Write answers to the questions connecting the position of elements in it.
Which is the element having very lowest ionization energy in group 1?
Element A
Ionization energy is the energy required to remove an electron.
It goes on decreasing as we move from top to bottom because:
i. The outer electrons are adding in a new outermost shell.
ii. Therefore, the distance between the outermost electron (valence electron) and the nucleus is also increasing.
iii. It becomes easy to remove electrons.
iv. Thus, ionization energy decreases.
Thus, element A has lowest ionization energy as we go down in group 1.
To remember:
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