An element A is soft and can be cut with a knife. This is very reactive to air and cannot be kept in the open. It reacts vigorously with water. The element is most likely to be
A. Magnesium
B. Sodium
C. Phosphorus
D. Chromium
Answer:B
An element A is soft and can be cut with a knife. This is very reactive to air and cannot be kept in the open. It reacts vigorously with water. The element is most likely to be
A. Magnesium B. Sodium C. Phosphorus D. Chromium