How does the valency of elements in the 2nd and the 3rd group vary on moving from left to right?
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The valencies according to the modern periodic table frm moving left to right across A group are
+1 +2 +3 4 -3 -2 -1 0
+1 +2 +3 4 -3 -2 -1 0
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When we move left to right in a period than the atomic number changes so the electronic configuration also changes and with the changing electronic configuration valency also changes.
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