What is the correct lewis structure for group 5a element arsenic?

Answer :  The correct option is, (A)

Lewis-dot structure : It shows the bonding between the atoms of a molecule and it also shows the unpaired electrons present in the molecule.  The valence electrons are represented by 'dot'.

The given element is, Arsenic

As we know that the arsenic is the element that belongs to the group 15 and the total number of valence electrons present in arsenic are, 5

The option A is correct because this structure shows that arsenic bonds chemically with the other by 5 covalent bonds. That means firstly, one-one electrons are filled singly then pairing takes palace. While the other options are incorrect options.

Hence, the correct option is, (A)

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 !

let that person have a turn to speak : )