DEF. 0F VELENCEY 1.NO. OF ELECTRON IN LAST SHELL.e.g H IS 1 ELECTRON IN LAST SHELL SO ITS VELENCEY IS 1 2.ABILITY IN AN ATOM TO SHARING OF ELECTRON e.g Ca SHARE 2 ELECTRON,H SHARE 1 ELECTRON .SO Ca HAS 2 VELENCEY & H HAS 1 3.ABILITY IN AN ATOM TO GAIN OR GIVE ELECTRON e.g NA GIVE 1 ELECTRON & Cl ACCEPT 1 ELETRON .SO BOTH VELENCEY IS 1. ...
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