Give one example of eacha) Metal having valency 2. b) Non metal having valency 2. c) Element with completely filled outermost shell. d) d) Element with three shells, having 4 electrons in the outermost shell.
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beryllium,sulphate,any noble gas (helium),i dont know the last one
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a) magnesium
b) oxygen
c) neon
d) silicon
i hope it helps....
b) oxygen
c) neon
d) silicon
i hope it helps....
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