neutrons
electrons
photons
protons
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
The fundamental particles present in equal numbers in neutral atoms are
The fundamental particles present in the nucleus of an atom are
The gas causing acid rain in an industrial area is
The gas dissolved in water that makes it basic is:
