A radioactive element A on disintegration gives two elements B and C. If B is helium and C is the element of atomic number 90 an

A radioactive element A on disintegration gives two elements B and C. If B is helium and C is the element of atomic number 90 and atomic mass 234, the element A is:
A. `._(92)^(238)U`
B. `._(88)^(234)Ra`
C. `._(90)^(234)Th`
D. `._(91)^(234)Pa`

A radioactive element A on disintegration gives two elements B and C. If B is helium and C is the element of atomic number 90 and atomic mass 234, the

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