Question

1. An element is soft and can be cut easily with a knife. It is very reactive and cannot be kept open in the air.
It reacts vigorously with water. This element is most likely to be :
(a) magnesium
Berpotassium
(c) phosphorus
(d) aluminium
alt by the other three​

Answer 1

It must be Potassium......

Answer 2

Answer:

c) phosphorus is the correct answer.