When atoms react, they tend to achieve an outer shell having eight electrons. Many of the representative elements (sodium and chlorine for instance) follow this rule when they form ions. In the ionic case they achieve the noble gas shell configuration by either a gain or loss of electrons.
A Personal Experience Timeline helps the writer generate a topic. The writer can use the timeline to see specific moments in their lifetime. The correct answer will be A.
Answer:
Population growth in the United States is due mainly to <em>Immigration</em>
Explanation:
United State still owns the record of the most immigrants in the world as at date, this has drastic effects on their population. Currently, measures are being put in place in order to avoid overpopulation which would optimize the population of the country.