Question

question 1-44
please use the provided copy of the periodic table for this question
two elements are in the same group (column) of the periodic table. what is the best explanation for why these elements have similar chemical properties?
○ they have the same number of protons in their nuclei.
○ they have the same number of neutrons in their most common isotope.
○ they have the same number of electrons in their outermost energy level (valence electrons).
○ they have the same total number of electrons in the atom.

Explanation:

Elements in the same group (column) of the periodic table have similar chemical properties because they share the same number of valence electrons (electrons in the outermost energy level). Valence electrons determine how an element bonds and reacts chemically.

Answer:

They have the same number of electrons in their outermost energy level (valence electrons).