CBSE Class 11-science Answered

A single electron in an ion has ionisation energy equal to 217.6 ev what is the total no. Of neutrons present in it

Asked by ashutosh25807 | 06 Feb, 2018, 07:02: AM

Expert Answer

Strategy:

If we want to find out the no. of protons first

1) find out the at no.

2) then u know the mass no.

3) by subtracting mass no. and atomic no. we will get no. of neutrons.

F o r m u l a colon I o n i s a t i o n space e n e r g y space equals space Z squared R subscript H space space 1 over n squared G i v e n colon R subscript H space equals space 13.6 e V F o r space sin g l e space e l e c t r o n space s p e c i e comma space n equals 1 S o l u t i o n colon I o n i s a t i o n space e n e r g y space equals space Z squared R subscript H space space 1 over n squared space space space space space space space space space space space space space space space space space space space 217.6 space equals space fraction numerator Z squared cross times 13.6 over denominator 1 squared end fraction space space space space space space space space space space space space space space space space space space space space space space space space Z to the power of 2 space space space end exponent equals space fraction numerator 217.6 over denominator 13.6 end fraction space space equals space 16 space l e t s space t a k e space s q u a r e space r o o t space w e space g e t comma space space space space space space space space space space space space space space space space space space space space space space space space space space space space space Z space equals space 4 H e r e space Z equals space a t o m i c space n u m b e r space equals space n o. space o f space e l e c t r o n s equals space n o. space o f space p r o t o n s space equals space 4 I n space p e r i o d i c space t a b l e space Z equals space 4 space i s space f o r space B e A n d space A t o m i c space m a s s space n o. space o f space B e space equals space 9 H e n c e comma space A equals space P space plus space N space space space space space space space o r space space N equals space A space minus space P space space space space space space space therefore space N space equals space 9 space minus space 4 space equals space 5 T o t a l space n o. space o f space p r o t o n s space p r e s e n t space i n space i t space i s space space 5

Answered by Ramandeep | 06 Feb, 2018, 09:54: AM

CBSE Class 11-science Answered

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CBSE Class 11-science Answered

Application Videos

Discovery of neutron

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Structure of Atom

Atomic Models

Structure of Atom

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