An element \( \mathrm{P} \) is soft and it can be cut with the help of a sharp object like knife... VIDEO
An element \( \mathrm{P} \) is soft and it can be cut with the help of a sharp object like knife. It is considered very reactive to air and cannot be kept open in the air. It reacts vigorously with water. Identify the element from the following that has the above property:
a. \( \mathrm{Ca} \)
b. \( \mathrm{Na} \)
c. \( \mathrm{Zn} \)
d. \( \mathrm{Mg} \)
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