A solution is a mixture (solvent + solute) of 2 or more elements, for example chocolate milk.
A solvent is the base of the solution which dissovles a solute, for example milk.
A solute is what is dossolved by the solvent, for example chocolate powder.
Sometimes, the types of the contaminents might have a slight or major effect on the concentration of your tirant and the reaction that takes place in your sample or multiple samples. The second and somewhat more important<span> reason for cleaning your </span>burette<span> has to </span>do<span> with water. When </span>you<span>'re </span>cleaning<span> your glassware, it is recommended to use water</span><span> to rinse it off.</span>
Valence electrons form bonds to create molecules and compounds because A. they are weaker than the electrons found closer to the nucleus.
A better way of saying it is that the valence electrons are <em>less strongly attracted</em> to the nucleus.
All electrons have the same size, but the <em>orbitals</em> they occupy have different sizes.
Your best bet is B or D. Most likely B