Water (H2<span>O) can be </span>called<span> a molecule or a compound because it is </span>made of hydrogen<span> (H) and </span>oxygen<span> (O) atoms. There are two main types of chemical bonds that hold atoms together: covalent and </span>ionic<span>/electrovalent bonds. Atoms that share electrons in a chemical bond have covalent bonds.
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BOLD is the correct one.
A.)Iodine = 126
B.)Bromine = 79
C.)Tellurium = 127
D.)Krypton = 83
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B ) Hydrogen
as O2 helps in combustion and Fuel is the one which is going to combust and heat is required to bring fuel to the combustion temperature