It represents the number of protons in the nucleus of an atom which determines the chemical properties of an element.
Its 2+! Dont mind this hdhdhdjhdndbdbdbdbsnnsjdndsnjd
It's the mitochondrion. It it the powerhouse of the cell and deals mainly with energy.
Gunpowder is a heterogenous mixture,
Reason : the composiotion of the mixture is not uniform throughout, the mixture can be separated by a suitable method , and finally , it composes of charcoal, sulfur and potassium nitrate which is not homogeneous mixture.
Halogens (atoms with 7 valence electrons) and Hydrogen
or generally, atoms with their shells almost full