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Q.

A mono valent anion has 10 electrons and 10 neutrons. The atomic number and the mass number of the element are respectively.

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a

9,18

b

10,20

c

11,20

d

9,19 

answer is .

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Detailed Solution


Mono

 

valent

 

anion

 

X−1=10e−

                               

X−1=X+1e− (It

 

gains

 

1e−)

So initially it has

 

9e−,

 

Z=9,  n=10

A=Z+n

 
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