Magnesium
Silicon
Sulphur
Phosphorous
The elements that provide colour to fireworks are
The enzyme that converts glucose to ethyl alcohol is
The exhaled air contains
The existence of different isotopes of an element is due to the presence of a different number of _ in the nucleus of their atoms
The fibre least prone to catch fire is
The first metal used by man was
The following are the half lives of four active isotopes. Which one of the following is the most dangerous to handle?
The formula C6H14 represents the hydrocarbon _.
The formula C6H5-CO-CH3 represents
The formula of lithium nitride is
