If you want an example then a car passing by a standing man is the best one !!
The sun makes the moisture go into the air and evaporate
Acids have hydronium ions and when dissolved in water, bases produce hydroxide ions. Hope this helps.
<span>Like the previous post states, the number of valence electrons (typically the group number for nonmetals)relates directly to the number of covalent bonds available. Additionally, when you exceed this number you create a cation and when you are less the number of potential bonds, you have created a anion.
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