What is the formula of a compound formed between iodine (i) and calcium (ca)?

The chemical formula for the compound will be

Explanation:

Calcium is the 20th element of the periodic table having electronic configuration of

This element will loose 2 electrons and thus shows an oxidation state of +2 units.

Iodine is the 53rd element of the periodic table having electronic configuration of

This element requires 1 electron and thus shows an oxidation state of -1 units.

So, by criss-cross method, the oxidation state of the ions will get exchanged and they form the subscripts of the other ions. This results in the formation of a neutral compound.

Hence, the chemical formula for the compound formed will be

the answer is a. co2, this would be colder than the : )

explanation:

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 !