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  Chemistry in 24 Hours

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Atoms and Molecules

Topic Review on "Title":

Matter is made of atoms, which form elements and molecules.

Atoms are the building block of matter.  They are the smallest particle that retains the chemical properties of the element.  Atoms are composed of protons, neutrons and electrons.  Protons and neutrons are in the nucleus and contribute to the mass of the atom.  Electrons are outside the nucleus, and together with the protons, contribute to the charge of the atom.

Ions are atoms that have a charge.  There is an unequal number of positive protons and negative electrons. 

Element Symbols
Element symbols are found on the periodic table.  Element symbols can give lots of information:   where X is the symbol, A is the mass number (protons + neutrons), Z is the atomic number (protons), C is the charge (protons – electrons) and N is the number of atoms present.

Isotopes are elements of the same atom (same number of protons) with a different number of neutrons (and therefore a different mass).  The atomic mass found on the periodic table is a weighted average of all the isotope’s individual masses.  The mass number shown in the element symbol above refers only to 1 specific isotope.

Atoms, Elements and Molecules
Atoms are the smallest particle retaining the chemical properties of the element.  Elements are pure substances that contain atoms with the same number of protons.  Molecules are pure substances that contain more than one type of atom chemically bonded together.

Rapid Study Kit for "Title":
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"Title" Tutorial Summary :

Chemistry is the study of matter and its interactions.  Matter is made of atoms, which make elements and molecules.  Basic atomic structure and symbology is introduced in this tutorial, along with ions and isotopes.

Tutorial Features:

Series Features:

  • Concept map showing inter-connections of new concepts in this tutorial and those previously introduced.
  • Definition slides introduce terms as they are needed.
  • Visual representation of concepts
  • Animated examples—worked out step by step
  • A concise summary is given at the conclusion of the tutorial.

"Title" Topic List:
  • Atoms
  • Ions
  • Element Symbols
  • Isotopes
  • Atoms, Elements, and Molecules

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