How to find the formula of hydride and oxide of an element using the modern periodic table?

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Solution

$T h e f o r m u l a o f h y d r i d e i s M_{1} H_{x} x i s t h e v a l e n c y o f t h e e l e m e n t . F o r e x ., G r o u p I m e t a l h a s v a l e n c y 1 N a_{1} H_{1} = N a H G r o u p I I m e t a l h a s v a l e n c y 2 C a_{1} H_{2} = C a H_{2} G r o u p I I I m e t a l h a s v a l e n c y 3 A l_{1} H_{3} = A l H_{3} T h e f o r m u l a o f t h e o x i d e i s M_{2} O_{x} x i s t h e v a l e n c y o f t h e e l e m e n t . F o r e x ., G r o u p I m e t a l h a s v a l e n c y 1 N a_{2} O_{1} = N a_{2} O G r o u p I I m e t a l h a s v a l e n c y 2 C a_{2} O_{2} = C a O G r o u p I I I m e t a l h a s v a l e n c y 3 A l_{2} O_{3} = A l_{2} O_{3}$

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