If an element, x, can form an oxide that has theformula x2o3, then element x would most likely be located on the periodic table in the same group as
(1) ba (3) in
(2) cd (4) na

(3) In

Explanation: As the given compound is , it can be said that X has a valency of 3.

1)Barium (Ba): Atomic no: 56: : In order to complete its octet, it needs to donate 2 electrons, and thus the valency is 2.

2) Cadmium (Cd) : Atomic no: 48: : In order to complete its octet, it needs to donate 2 electrons, and thus the valency is 2.

3) Indium (In): Atomic no: 49: : In order to complete its octet, it needs to donate 3 electrons, and thus the valency is 3.

4) Sodium (Na): Atomic no: 11: : In order to complete its octet, it needs to donate 1 electron, and thus the valency is 1.

So the given element could only belong to the group containing Indium (In) as all the elements in the same group exhibit similar valency.

14 days is the half-life of phosphorus-32