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An element X has mass number 40 and contains 21 neutrons in its atom. To which group of the Periodic Table does it belong?

 
Periodic Classification Of Elements
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12/11/2020 11:39 am
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romiroy12
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An element X has mass number 40 and contains 21 neutrons in its atom. To which group of the Periodic Table does it belong?

(a) Group 1

(b) Group 4

(c) Group 2

(d) Group 3

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class 10 cbse ncert periodic classification elements
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12/11/2020 11:40 am
Anonymous 
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(a) Group 1

Explanation:

e = 19 (2, 8, 8,1)

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Topic Tags:  class 10 (8819) , cbse (15084) , ncert (13840) , periodic classification (299) , elements (299) ,
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