Please help asap !! i don’t know if that’s the right answer

b, c and d (last three options)

Explanation:

It can't be the first one because:

On the left hand side there is one of everything and then on the right, ther is one zinc, two chloride and 2 hydrogen atoms. It is unbalanced

Second one:

there are 8 carbons on both sides, 20 hydrogens on both sides and 26 oxygen on both sides. It is balanced

Third

1 copper on both sides, 2 hydrogens on both sides and 1 oxygen on both sides. It is balanced

Fourth

4 silver on both sides and 2 oxygens on both sides

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.

air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

hope this mark me brainliest