1)a)vander waals force b)ionic force C)vander waal d)H-bonding 3) its 1 4) there are 12 edges and each atom on the edge will give a contribution of 1/4.s effective no. of atoms if 1/4 *12=3 hope this helps !!!!!!!!!!!
Varsha
be cool,
tomorrow is what we make it today,
so if u can dream it , u can make it .
life is an ice cream ,eat it before it melts away!!!!!!!!!
Moderation Team
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