Question

1. describe the basic organizational feature of the periodic table of the elements. science notebook · matter—properties and changes 35

Explanation:

The periodic table organizes elements by atomic number. Elements are arranged in periods (rows) and groups (columns). Periods indicate electron - shell levels, and groups have similar chemical properties due to the same number of valence electrons.

Answer:

Elements are arranged in order of increasing atomic number, in periods (rows) and groups (columns). Periods correspond to electron - shell levels and elements in the same group have similar chemical properties because they have the same number of valence electrons.