Answer: The correct option is 3.
Explanation: We are given a compound which is made up of iron and oxygen only. The ratio of the two are given as:
This means that, number of iron ions are 2
Number of oxide ions are 3
From the above information, the formula becomes : 
The valency of iron = 3
Valency of oxide = 2
This compound is named as iron (III) oxide.
Hence, the correct option is 3
Answer:
<em>Electrons in each orbital contain a set quantity of energy.</em>
Explanation:
<em>As long as an electron remains in the same orbital, the energy content of that electron remains constant. Electrons can move between orbits by releasing or absorbing energy.</em>
Chlorine + aluminium bromide --> aluminium chloride + bromine
Chlorine replaces bromide in AlBr3
3Cl2 + 2AlBr3 ---> 2AlCl3 + 3Br2
Hope it helped!
Answer:
Because they are smaller than an atom
Explanation:
