1.

88R226 Experiences three a - decay. Find the number of neutrons in the  daughter element.

Answer»

Mass number of 88Ra226 is 266 

Atomic number of 88Ra226 is 88 

Mass number of α = 4

Atomic number of α = 2 

After 3 a decay 

Mass number of the daughter element is 

= 226 – (3 × 4) 

= 226 – 12 

= 214 

Atomic number of the daughter element is

= 88 – (3 × 2) 

= 88 – 6 

= 82 

Number of neutrons is 

= 214 – 82 

= 132



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