What does the subscript 2 indicate in the formula o2? oxygen transferred 2 electrons to form the bond. each oxygen atom is sharing two electrons. there are two atoms in the molecule. there are two valence electrons in the molecule.

C) There are two atoms in the molecule.

Explanation:

In convention (accepted style) of writing out chemical equations and formular, it is understood that the subscript after an element tells us the number of atoms of said element.

For example, in the compound below, we can tell that;

H₂CO₃

There are 2 hydrogen atoms, 1 carbon atom and 3 Oxygen atoms.

We apply same principle to O2 and we now know the number 2 signifies the number of atoms present in the molecule.

Applying elimination on the other options, we have;

A) This option is not correct because electrons transferred or gained are represented by a charge which is the superscript after the element. E.g O²⁻

B) This option is wrong because sharing of electrons are not represented in the formular of a molecule or compound.

D) Valance electrons are usually represented by oxidation number. So this is wrong too.

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considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.