Brainliest if answer in next 5 when writing chemical formulas: enter subscripts after the letters, for instance, h2o = hs2o. also, don't forget to use proper chemical shorthand for chemical symbols. for instance, chlorine = cl but not cl or cl. when balancing equations: leave the box empty if no other coefficient is needed. writing the symbol implies "1." the halogen elements are all: a.) period vii atoms b.) from group vii c.) inert gases d.) active metals

Option (B) is the correct answer.

Explanation:

Elements present in group VII are known as halogens. Elements of group VII are fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (As).

Since, they are same group elements so all of them have seven valence electrons.

Whereas inert gases are the gases present in group 8. These are helium, neon, argon, krypton, xenon, and radon.

Active metals are the substances that readily react with another substance. Elements of group 1 are known as active metals as they have only one valence electron.

Therefore, we can conclude that out of the following the halogen elements are all from Group VII.

water is used to store them because it would keep the radiation from getting out in the open and causing harm to the workers

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !