An element has 2 electrons in its shell .
i)Identify the element .
ii)What type of ion will it form ?
iii)What will be the formulae of its chloride ?
iv)Predict the solubility of its chloride .

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Solution

$a) T h e e l e m e n t h a s 2 e l e c t r o n s i n i t s v a l e n c e s h e l l . S o i t b e l o n g s t o g r o u p I I . A l k a l i n e e a r t h m e t a l . b) T h e c a t i o n f o r m e d i s o f t h e t y p e M^{2 +} - c a t i o n c) T h e c h l o r i d e s a r e o f t h e f o r m u l a M C l_{2} d) T h e s o l u b i l i t y o f t h e i r c h l o r i d e s i n c r e a s e s o n i n c r e a \sin g t h e s i z e . T h a t m e a n s d o w n t h e g r o u p m e t a l c h l o r i d e s a r e m o r e s o l u b l e i n w a t e r . B e C l_{2} i s c o v a l e n t a n d o t h e r c h l o r i d e s o f t h i s g r o u p a r e i o n i c .$

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An element X is in group 2 of the periodic table :

(a) What will be the formula of its chloride?

(b) What will be the formula of its oxide?

^{'} X^{'}

H

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