the elements – 117 elements; 94 occur naturally on earth. new elements are discovered from time to...
Post on 01-Apr-2015
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THE ELEMENTS – 117 ELEMENTS; 94 OCCUR NATURALLY ON EARTH. NEW ELEMENTS ARE DISCOVERED FROM TIME TO TIME THROUGH ARTIFICAL NUCLEAR REACTIONS
CHEMICAL COMPOUND
TWO OR MORE ELEMENTS BONDED TOGETHER IN DEFINITE PROPORTION BY MASS
They form to lower the energy of the entire System, the components of the system becomeMore stable.Example: It is easier on our bodies to lie down than to stand up.
Thus, it is nature’s way of allowing the elements to lie down!
Covalent Bonding: exists when 2 electrons are shared by two non metallic atoms
Ionic Bonding – results in the attraction between a negative charged ion (anion) and a positive charged ion (cation)
MOLECULE – 2 OR MORE ATOMS JOINED BY CHEMICAL BONDS; 2 ATOMS OF THE SAME ELEMENT MAY JOIN OR COMBINED ATOMS
Van der Waal’s Force are weak attractive forces that hold non polar molecules together.
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