HS-PS1-1

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.

  1. Physics

    Neutrinos not so fast

    Scientists say the particles may not outrace light after all.

    By Stephen Ornes
  2. Physics

    Explainer: How a synchrotron works

    Giant magnets direct superfast light into beams up to 30 million times as bright as those produced by a laser pointer.

    By Emily Sohn