an element has atomic mass 32 and its nucleus has 16 neutrons. to which group of periodic table does it belong? explain.

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Solution

$E l e m e n t h a s a t o m i c m a s s o f 32 T h a t i s n u m b e r o f p r o t o n s + n u m b e r o f n e u t r o n = 32 N u m b e r o f n e u t r o n = 16 N u m b e r o f p r o t o n = 32 - 16 = 16 S o a t o m i c n u m b e r i s = 16 16 m e a n s t h e e l e c t r o n i c c o n f i g u r a t i o n i s 2, 8, 6 T h u s i t b e l o n g t o 16 t h g r o u p (10 + 6), a s i t s v a l e n c e s h e l l h a s 6 e l e c t r o n . T h a t i s t h e e l e m e n t b e l o n g t o o x y g e n g r o u p .$

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(a) An element X has mass number 40 and contains 21 neutrons in its atom. To which group of the periodic table does it belong?

(b) The element X forms a compound $X_{2}$ Y. Suggest an element that Y might be and give reasons for your choice.

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