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a] magnesium mg12. period - 3
Group - 2
b] - X[11] is Na sodium atomic no. 11
Y[13] is aluminum atomic no. 13
1) a sodium has more metallic character.
2) valency of sodium 1,-1
Aluminum 3,1
3) aluminum 13 and sodium 11 come in same period i. e 3rd period. Due to addition of electrons, in same shell in aluminum the nuclear charge on aluminum is more than that of Naani thus the atomic tends to shrink a little in size. Hence, Al has a smaller atomic size than Na.
4) the least reactive group is the group of noble games.
All the noble games have their outer electrons he'll complete. This means the don't want to lose or gain any electrons. This makes them non-reactive.
Hope it helps you
Group - 2
b] - X[11] is Na sodium atomic no. 11
Y[13] is aluminum atomic no. 13
1) a sodium has more metallic character.
2) valency of sodium 1,-1
Aluminum 3,1
3) aluminum 13 and sodium 11 come in same period i. e 3rd period. Due to addition of electrons, in same shell in aluminum the nuclear charge on aluminum is more than that of Naani thus the atomic tends to shrink a little in size. Hence, Al has a smaller atomic size than Na.
4) the least reactive group is the group of noble games.
All the noble games have their outer electrons he'll complete. This means the don't want to lose or gain any electrons. This makes them non-reactive.
Hope it helps you
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