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Transcript of Periodic Table
Both properties of metals
They show variable valence
Reactive nonmetallic elements
The Oxygen Family
The periodic table was first organized by Dmitri Mendeleev
A table of the chemical elements
Arranged in order of atomic number, usually in rows, so that elements with similar atomic structure appear in vertical columns
Is a chemical rule, that states that atoms of low atomic number tend to combine in such a way that they each have 8 electrons in the valence shells
A number assigned to an element in chemical
combination that represents the number of electrons lost by an atom of that element in compound.
Rows of elements are called periods. The period number of an element signifies the highest unexcited energy level for an electron in that element. The number of elements in a period increases as you move down the periodic table because there are more sublevels per levels as the energy level of an atom increases
Columns of elements help define
element groups. Elements within a group share several common properties. Groups are elements have the same outer electron arrangement. The outer electrons are called valence electrons. Because they have the same number of valence electrons, elements in a group share similar chemical properties. The Roman numerals listed above each group are the usual number of Valence Electrons.
usually refers to the one-
or two letter abbreviation
for a chemical element.
The atomic number is equal to the number of
protons in an atoms nucleus. The atomic number determines which element an atom is.
The average mass of atoms of an element, calculated using the relative abundance of isotopes in a naturally- occurring element.
Groups of The