My teacher said something about 2 valence electrons in Beryllium, Hydrogen, Lithium and Boron.
So if they loose all of their valence electrons, they will have two valence electrons left?
Unlike the other ones that loose all of their valence electrons and have 2 valence electrons left?
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Start with the periodic table atom numbers.
1. hydrogen which have total 1 electron and have valency of 1. means it can bind with other atom by 1 electron and make a single bond.
2. Helium which have 2 electron but no valence electron
3. Lithium which have 3 electron but only 1 is used as valence electron because other two makes a pair so not useful.
4. Beryllium which have 4 electron but no valence. But at a time of excitation it can bind to other atom.
5. Boron total have 5 electron an 1 valence electron.
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