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Answer the following questions:
Answer variants:
Be (atomic number \(4\)) and Ca (atomic number \(20\)) have different electronic configuration, i.e. two electrons in outermost shells.
Beryllium (Be). In the periodic table, the elements placed on the left show maximum metallic characteristics.
\(K_2O\), \(CO_2\), \(Al_2O_3\), \(SiO_2\), \(BaO\).
\(KH\), \(CH\), \(AlH\), \(SiH\), \(BaH\).
1. Use Mendeleev’s Periodic Table to predict the formulae for the oxides of the following elements : K, C, Al, Si, Ba
2. By considering their position in the Periodic Table, which one of the following elements would you expect to have maximum metallic characteristics ? Ga, Ge, As, Se, Be
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