an atom of an element contains 9 protons and 10 neutrons .a) write its electronic configuration .b)represent the ion formed by the element geometrically

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Solution

$a) N u m b e r o f p r o t o n = N u m b e r o f e l e c t r o n = A t o m i c n u m b e r = 9 S o i t s c o n f i g u r a t i o n i s 2, 7 T h e m a s s n u m b e r o f t h e l e m e n t i s = N u m b e r o f p r o t o n + n u m b e r o f n e u t r o n = 9 + 10 = 19 b) T h e i o n f o r m e d b y t h e e l e m e n t = X^{-} a n a n i o n . B e c a u s e o n g a i n i n g 1 e l e c t r o n i t a t t a i n s t h e s t a b l e e l e c t r o n i c c o n f i g u r a t i o n .$

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