Atoms and molecules
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Atoms and molecules. By: Sabrina Karasik & Kyla Formey. Atoms. Atoms are the basic building blocks of matter that make up everyday objects. A desk, the air, even you are made up of atoms!

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Atoms and molecules

Atoms and molecules

By: Sabrina Karasik & Kyla Formey


  • Atoms are the basic building blocks of matter that make up everyday objects. A desk, the air, even you are made up of atoms!

  • There are 90 naturally occurring kinds of atoms. Scientists in labs have been able to make about 25 more.

  • They are made with 3 basic particles:

  • Protons

  • Neutrons

  • Electrons


  • An electron is negatively charged

  • A proton is positively charged

  • A neutron is neutral (no charge)

  • Adding a proton forms a new kind of atom

  • The protons and neutrons cluster together in the central part of the atom, called the nucleus and the electrons 'orbit' the nucleus.

  • A particular atom will have the same number of protons and electrons and most atoms have at least as many neutrons as protons.


  • A molecule is formed when two or more atoms are joined together by chemical bonds.

  • All compounds are molecules but not all molecules are compounds.

  • A compound is a molecule that is made up of at least 2 different elements.

  • Some examples of molecules are H2O (water) , N2 (nitrogen) , O3 (ozone) , CaO (calcium oxide) ,

  • C6 H12 O6 (glucose)


  • Molecules come in different shapes, sizes and complexities.

  • Molecules are always in motion.

  • They are packed tightly together in solids and liquids.

  • In a solid molecules have rapid vibration.

  • In a liquid molecules move around freely among each other.


  • In a gas molecules are able to move more freely because the density of the molecules are less than in a solid and a liquid.

  • The speed of molecular motion increases as the absolute temperature increases.

  • Single atoms of elements such as a single O (oxygen) are not molecules. But if that oxygen bonds with itself or another element then it forms a molecule.