Elements and the Periodic Table

Who invented the Periodic Table?

• Mendeleev

• Bohr

• Lewis

• Democritus

Group 17: All nonmetals. Very reactive. Poor conductors of heat and electricity. Tend to form salts with metals. These elements have 7 valence electrons.

• Noble gases

• metalloids

• Nitrogen Group

• Halogens

Elements in the same group or column have the same ...

• # of valence electrons

• # of shells

• # of protons

• Mass Number

Rows on the periodic table are called ___________.

• Periods

• groups

• families

Group 18: Unreactive nonmetals. All are colorless, odorless gases at room temperature. These elements have a full outer energy level, usually 8 valence electrons, except for Helium which only has 2 valence electrons.

• Nitrogen Group

• Oxygen Group

• Noble Gases

• Halogens

Elements in the same group have __________

• Similar Properties

• Same number of shells

• Similar Mass

What do all elements in the same period have?

• same number of shells

• same number of electrons

• belong in the same family

Elements with atomic numbers 57-70 and 89-102: These metals were taken out and placed at the bottom of the table. Some are shiny and reactive, while others are radioactive and unstable. Elements 95-103 do not exist in nature but have been manufactured in the lab.

• Alkali Metals

• Alkaline-earth Metals

• Lanthanides and Actinides

• halogens

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The vertical columns on the periodic are called _______________.

• Rows

• Periods

• Groups

• Valence

Elements of the same ______________ have the same number of valence electrons, which determines the elements chemical properties.

• Period

• Row

• Group

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