CHAPTER 5- THE PERIODIC TABLE – CHEMISTRY. Quality content you can rely on!

CHAPTER 5- THE PERIODIC TABLE – CHEMISTRY.
Quality content you can rely on!
Periodic table - Answer: An arrangement of elements in columns, based on a set of
properties that repeat from row to row.


Period - Answer: A row in a periodic table of elements.


Group - Answer: A column of elements in a periodic table.


Periodic law - Answer: The pattern of repeating properties displayed by elements in the
periodic table.


Atomic mass unit - Answer: One twelfth the mass of a carbon-12 atom.


Metals - Answer: Elements that are good conductors of heat and electric current.


Transition metals - Answer: Elements that from a bridge between elements on the left
and right sides of the periodic table.


Nonmetals - Answer: Elements that are poor conductors of heat and electric current.


Metalloids - Answer: Elements with properties that fall between those of metals and
nonmetals.


Valence electron - Answer: An electron that is in the highest occupied energy level of
an atom.


Alkali metals - Answer: The elements in Group 1A of the periodic table, not including
hydrogen.


Alkaline earth metals - Answer: The elements in Group 2A of the periodic table.

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