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LU4 & LU5, (What is the shielding effect?, The shielding effect can be…

- - - - Q.7. Caesium, Cs
        Q.8. Bromine, Br
- - - - Down a group, the number of energy levels (n) increases, so there is a greater distance between the nucleus and the outermost orbital. This results in a larger atomic radius.
    - - Atomic radius is the distance from the atom's nucleus to the outer edge of the electron cloud. In general, atomic radius decreases across a period and increases down a group. Across a period, effective nuclear charge increases as electron shielding remains constant.
- - - - Q1 the reactivity of Group 1 elements increase as go down the group because the atoms get larger when go down the group. The outer electron gets further from the nucleus went go down the group.
    - - Q2 Polarizing power is the ability of cation to distort the electron density of anion towards itself or we can say that ability of cation to pull the electron density of anion towards itself.