ATOMS ELEMENTS PERIODIC TABLE MOLECULES COMPOUNDS.

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Presentation transcript:

ATOMS ELEMENTS PERIODIC TABLE MOLECULES COMPOUNDS

atom the smallest component of an element having the chemical properties of the element, consisting of a nucleus containing combinations of neutrons and protons and one or more electrons bound to the nucleus by electrical attraction; the number of protons determines the identity of the element.

Atom- lithium

ATOMS

Element Chemistry. one of a class of substances that cannot be separated into simpler substances by chemical means. Listed on the periodic table of elements.

PERIODIC TABLE a table illustrating the periodic system, in which the chemical elements, formerly arranged in the order of their atomic weights and now according to their atomic numbers, are shown in related groups.

PERIODIC TABLE

dex.htmlwww.uky.edu/Projects/Chemcomics/in dex.html

TRENDS ON THE PERIODIC TABLE GOING ACROSS--  INCREASING NUMBER OF ELECTIONS GOING DOWN INCREASING NUMBER OF ELECTRON SHELLS & INCREASING RADIUS (LARGER) GROUPS HAVE SIMILAR PROPERTIES

MOLECULES Chemistry, Physics. the smallest physical unit of an element or compound, consisting of one or more like atoms in an element and two or more different atoms in a compound.

COMPOUNDS A compound is a substance formed when two or more chemical elements are chemically bonded together. Two types of chemical bonds common in compounds are covalent bonds and ionic bonds.covalent bondsionic bonds

COMPOUNDS What is the difference between a compound and a molecule? A molecule is formed when two or more atoms join together chemically. A compound is a molecule that contains at least two different elements. All compounds are molecules but not all molecules are compounds.atomselements Molecular hydrogen (H 2 ), molecular oxygen (O 2 ) and molecular nitrogen (N 2 ) are not compounds because each is composed of a single element. Water (H 2 O), carbon dioxide (CO 2 ) and methane (CH 4 ) are compounds because each is made from more than one element. The smallest bit of each of these substances would be referred to as a molecule. For example, a single molecule of molecular hydrogen is made from two atoms of hydrogen while a single molecule of water is made from two atoms of hydrogen and one atom of oxygen.hydrogenoxygen nitrogen

COMPOUND OR MOLECULE?

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