A
Phosphorous
B
Bromine
C
Chlorine
D
Helium
Mercury exists as liquid at room temperature, but bromine is a non metal which is liquid at room temperature.
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A
Neutrons
B
Positrons
C
Protons
D
Electrons
Isotone, any of two or more species of atoms or nuclei that have the same number of neutrons. Thus, chlorine-37 and potassium-39 are isotones, because the nucleus of this species of chlorine consists of 17 protons and 20 neutrons, whereas the nucleus of this species of potassium contains 19 protons and 20 neutrons.
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A
Liquified Petroleum Gas
B
Hydrogen
C
Methane
D
Compressed Natural Gas
Calorific value is nothing but the energy contained in a fuel or food, determined by measuring the heat produced by the complete combustion of a specified quantity of it. This is now usually expressed in joules per kilogram. Hence, hydrogen has the highest calorific value.
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