10. Group IIA elements: Be, Mg, Ca, Sr have a ___________charge. +2 or +3
10. Group IIA elements: Be, Mg, Ca, Sr have a ___________charge. +2 or +3
Homework Answers
ANSWER : Group IIA elements : Be, Mg, Ca,Sr have a +2 charge.
In periodic table , Be, Mg, Ca,Sr, Ba, Ra these elements are placed in Group IIA. The E.C of these elements are
4 Be : [He] 2s2
12 Mg : [Ne] 3s2
20 Ca : [Ar] 4s2
38 Sr : [Kr] 5s2
56 Ba : [Xe] 6s2
All these elements have two electrons in the valence shell. After loosing these two electrons elements acquire a noble gas electronic configuration and achieves extra stability. Hence , they have +2 charge.
If 3 electrons are lost by these elements, they do not acquire noble gas electronic configuration . Hence, they do not have +3 charge.
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10. Group IIA elements: Be, Mg, Ca, Sr have a ___________charge.
+2 or +3
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