Fron(II) chloride is a product of the reaction between iron metal and hydrochloric acid as shown in the equation: Fe + 2HCI → FeCl2 + Hz. What is the change in oxidation number for iron in this reaction?
A From 0 to 2
B. From 1 to 2
c. From 0 to 2
D. From 1 to 2

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

explanation:

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

if you need further assistance, let me know: )

~ trueboss72

since electrons are negative the answer is neagtaive

i think its 100.

hope this !