Lead chloride solution is a SUBSTANCE.
All the matters in the universe can be divided into two basic classes, these are pure substances and mixtures. A pure substance can be an element or a compound. Mixtures are made up of two or more different particles while pure substances are made up of identical particles. Lead chloride is an inorganic compound and is considered to be a pure substance; it also occurs as a minerals. <span />
I think you’ve made a mistake
2.8 billion miles which can be said as 4.5 billion kilometres
hope this helps x
B. Has natural predators to limit population
If you where to randomly pick two nonmetals that have less than 10 protons it would be Hydrogen and carbon.