An element E loses one `alpha` and `beta`-particles in three successive stages. The resulting element will be

An element E loses one alpha and two beta -particles in three successive stages. The resulting element will be

An element X loses one alpha- and two beta- particles in three successive stages. The resulting element will be

An element Xloses one and twoßparticles in three successive stages. The resulting element will be:

An alkaline earth metal is radioactive. It and its daughter element decay by emitting 3 alpha - particles in succession. In what group should the resulting element be formed?

An alkaline earth metal is radioactive. It and its daughter element decay by emitting 3 alpha - particles in succession. In what group should the resulting element be formed?

A radio-active elements emits one alpha and beta particles then mass no. of daughter element is :

A radio-active elements emits one alpha and beta particles then mass no. of daughter element is :

A nucleus "_n^mX emits one alpha -particles and two beta -particles. The resulting nucleus is: