Iron should be in the 3d block
No He believed tiny particles were invisible and couldn't be changed....So No The person that believed in this was Dalton .
Answer:
The correct answer is: X is nitrogen dioxide, and Y is a metal oxide
Explanation:
Combustion of compound of containing nitrogen and metal will give nitrogen dioxide and metal oxide as product. During combustion reaction a compound reacts with oxygen in order to yield oxides of elements present in the compound.
The general equation is given as:

Hence, the correct answer is :X is nitrogen dioxide, and Y is a metal oxide.
Because it throws the earth off balance and if it does it often enough then it will soon add up.