HS-PS1-1: Valence Electrons and Properties of Elements

Use the periodic table as a model to predict the relative properties of elements based on the patterns of electrons in the outermost energy level of atoms.

Clarification Statement: Examples of properties that could be predicted from patterns could include reactivity of metals, types of bonds formed, numbers of bonds formed, and reactions with oxygen.

Assessment Boundary: Assessment is limited to main group elements. Assessment does not include quantitative understanding of ionization energy beyond relative trends.


The following assessments were created by science teachers hoping to better understand the NGSS. In most cases teachers went from standard to assessment in around an hour.  These are drafts and should be used accordingly. Feel free to improve these assessments or contribute to the collection. Learn more about assessment design here.



Anchor Charts



Nucleus (positively-charged)
 - Protons
 - Neutrons
Electrons (negatively-charged)
Valence electrons
Periodic table
Elemental properties (e.g. reactivity of metals, types of bonds formed, number of bonds formed, reactions with oxygen)

Learning Plans

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