Fill in the blanks. a. 81Br- has neutrons protons electrons b. 63Cu2 has neutrons protons electrons c. 18O2- has neutrons protons electrons d. 14C has neutrons protons electrons

Answer in explanation

Explanation:

To answer the question, we know that the atomic mass is the sum of the number of protons and neutrons. The number of protons equals the number of electrons in an electrically neutral atom. For positively charged ion, there is loss of electron, we subtract the charge from the number of protons. For negatively ion, there is a gain of electron, we add the charge to the number of protons

A 81Br- has gained one electron

P = 35

N = 81 - 35 = 46

E = 35 + 1 = 36

B. 63Cu2+ has lost 2 electrons

P = 29

N = 63 - 29 = 33

E = 63 - 2 = 61

C. 18O2- has gained 2 electrons

P= 8

N = 18 - 8 = 10

E = 8 + 2 = 10

D. 14C is electrically neutral P = E

P = 6

N = 14 - 6 = 8

E = 6

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 !