HS-PS1-1: Determining the Number of Valence Electrons in Atoms
HS-PS1-1: Use the periodic table as a model to predict the relative properties of elements based on patterns of electrons in the outermost energy levels of atoms.
This video gives a quick summary of how to determine the number of valence electrons in the representative elements. These are the elements found in the two left-most columns (below H and Be) and the six right most columns (below B, C, N, O, F and He).
Many properties of the elements can be predicted once you know how many valence electrons an atom possesses. Elements in the same vertical column (H, Li, Na, K...) will have the same number of valence electrons which means that they will have similar chemical properties.
One exception to this pattern is found in the Noble gases. Helium has only two valence electrons while the other Noble gases contain eight.
This video gives a quick summary of how to determine the number of valence electrons in the representative elements. These are the elements found in the two left-most columns (below H and Be) and the six right most columns (below B, C, N, O, F and He).
Many properties of the elements can be predicted once you know how many valence electrons an atom possesses. Elements in the same vertical column (H, Li, Na, K...) will have the same number of valence electrons which means that they will have similar chemical properties.
One exception to this pattern is found in the Noble gases. Helium has only two valence electrons while the other Noble gases contain eight.
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