An element A is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following. 

An element is soft and can be cut with a knife. It is very reactive and cannot be kept open in the air. It reacts vigorously with water. The element is most likely to be:

Identify a metalloid from the following list of elements

Identify a metallloid from the following list of elements

An element A belongs to 14th group is a metal, which can be cut with a knife. It is not a good conductor of heat and electricity. A in pure state does not react with water but air dissolved water forms hydroxide. Identify A.

An element A belongs to 14th group is a metal, which can be cut with a knife. It is not a good conductor of heat and electricity. A in pure state does not react with water but air dissolved water forms hydroxide. Identify A.