Question

module 4: electrons in atoms test - 11/14/2025
strontium and barium have similar chemical properties because atoms of these elements have the same number of
protons.
electron shells.
valence electrons.
neutrons.

Explanation:

Chemical properties of elements are mainly determined by the number of valence electrons. Elements in the same group of the periodic table have the same number of valence electrons and similar chemical properties. Strontium (Sr) and barium (Ba) are in Group 2 of the periodic table, so they have the same number of valence electrons (2 valence electrons). Protons determine the identity of an element. Electron - shells and neutrons do not directly determine the similarity of chemical properties in the way valence electrons do.

Answer:

valence electrons.