Question
How does electronic configuration vary down a group in the modern periodic table?
| Group number | General outer configuration | Examples |
| Group 1 | $ns ^{ 1 }$ | ${ }_3 Li : 2 s ^{1},{ }_{11} Na : 3 s ^1$ |
| Group 2 | $ns ^2$ | ${ }_4 Be : 2 s ^2,{ }_{12} Mg : 3 s ^2$ |
| Group 3 | $ns ^2( n -1) d ^{1}$ | ${ }_{21} Sc : 4 s ^2 3 d ^{ l },{ }_{39} Y : 5 s ^2 4 d ^1$ |
| Group 13 | $ns ^2 np^I$ | ${ }_5 B : 2 s ^2 2 p ^1,{ }_{13} A 1: 3 s ^2 3 p ^1$ |
| Group 14 | $ns ^2 np ^2$ | ${ }_6 C : 2 s ^2 2 p ^2,{ }_{14} Si : 3 s ^2 3 p ^2$ |
| Group 15 | $n s^2 n p^3$ | ${ }_7 N : 2 s ^2 2 p ^3,{ }_{15} P : 3 s ^2 3 p ^3$ |
| Group 16 | $ns ^2 n p^4$ | ${ }_8 O : 2 s ^2 2 p ^4,{ }_{16} S : 3 s ^2 3 p ^4$ |
| Group 17 | $n s^2 n p^5$ | ${ }_9 F : 2 s ^2 2 p ^5,{ }_{17} C 1: 3 s ^2 3 p ^5$ |
| Group 18 Mal | $ns ^2 np ^6$ | ${ }_{10} Ne : 2 s^2 2 p^6,{ }_{18} Ar : 3 s^2 3 p^6$ |
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