H1 chemistry atomic structure

SunnyFly SG

Some isotopes are unstable and decompose naturally. In one type of decomposition, a neutron in the nucleus decomposes to form a proton, which is retained in the nucleus, and an electron, which is expelled from the atom. Which change describes a process of this sort?

A) 11C --> 12C

B) 22Na--> 22Ne

C) 32P --> 31P

D) 40K --> 40Ca

Ans:D

Can anyone explain to me why isn't the ans B since and electron is expelled from the atom?

Thanks in advance! (:

jayh272416 SG

For B, the 22Na will become 22Mg instead if it is a process of that sort.

SunnyFly SG

Uhh. But i don't really understand the part on the electron being expelled from the atom.

UltimaOnline SG

Uhh. But i don't really understand the part on the electron being expelled from the atom.

It means the species generated is a unipositive cation. Your options should read :

A) 11C --> 12C+

B) 22Na--> 22Ne+

C) 32P --> 31P+

D) 40K --> 40Ca+