Bigger size elements have low ionization energy and high shielding effect because:
Shielding effect:
- This effect describes the decrease in attraction between an electron and the nucleus in any atom with more than one electron shell.
- The more electron shells there are, the greater the shielding effect experienced by the outermost electrons.
- When shielding effect decreases the attraction force exerted by the nucleus increases on valence electrons.
- As a result, atoms will be larger.
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