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C4 ­ Chemical Patterns ­ Answers
1. In the Periodic Table, the elements are arranged in order of proton number, also called atomic number. This is
the number of positive protons in each atom. It is shown as the number written below each element in the table
below. Putting elements…

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Lithium - If a piece of hot lithium is lowered into a jar of chlorine, white powder is produced and settles on the
sides of the jar. This is the salt lithium chloride. 2Li(s) + Cl2(g) 2LiCl(s)
Sodium - If a piece of hot sodium is lowered into a jar…

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This type of reaction happens with all of the halogens. A more reactive halogen displaces a less reactive halogen
from a solution of one of its salts. The most reactive halogen displaces all of the other halogens from solutions of
their salts, and is itself displaced by none of the…

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the nucleus. The force of attraction between the positively-charged nucleus and the negatively-charged outer
electron becomes weaker, which is why the outer electron is more easily lost.
Fluorine (Group 7) - Fluorine atoms have nine electrons. Two of these fit into the first shell, and
the remaining seven electrons fit…

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Conductive when liquid - ions are charged particles, but ionic compounds can only conduct electricity if their ions
are free to move. So ionic compounds do not conduct electricity when they are solid, but they do conduct
electricity when they are dissolved in water or when they are melted.

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