Question

1. what do atoms of elements that are in the same group share?

a number of protons
b number of protons and neutrons
c number of valence electrons
d number of neutrons

Explanation:

Elements in the same group of the periodic table have the same number of valence electrons, which determines their chemical - reactivity and bonding behavior. Protons define the element itself and vary between different elements in a group. Neutrons can vary even within the same element (isotopes).

Answer:

C. number of valence electrons