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Atomic Mass and Mass Number

an isotope of...

Question

an isotope of atomic mass 27 has 14 neutrons in the nucleus what is the atomic number ,name and symbol of the element

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Solution

$A t o m i c m a s s = n o o f p r o t o n s + n o o f n e u t r o n s 27 = 14 + n o o f p r o t o n s N o o f p r o t o n s = 27 - 14 = 13 S o t h e a t o m i c n u m b e r i s 13 . T h e e l e m e n t n a m e i s A l u m i n i u m a n d i t s s y m b o l i s A l$

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