Final Answer:
Color the elements with 1 valence electron is:
d. Form a negative charge
Step-by-step explanation:
Valence electrons are the electrons in the outermost shell of an atom and play a crucial role in determining an element's chemical properties. Elements with 1 valence electron typically belong to Group 1 of the periodic table, such as alkali metals like sodium and potassium.
These elements have a tendency to lose their valence electron to achieve a stable, noble gas configuration. When an element loses an electron, it forms a positive charge. However, in the context of elements with 1 valence electron, the question is asking about the behavior of an element that gains an additional electron.
When an element gains an electron, it fills its outer electron shell, achieving a stable, noble gas configuration. This process results in the formation of a negative charge because the atom now has more electrons than protons.
Elements with 1 valence electron, which are typically found in Group 17 of the periodic table (halogens), demonstrate this behavior. They tend to gain one electron to complete their outer shell and attain a stable electronic configuration. Therefore, the correct choice is "d. Form a negative charge" for elements with 1 valence electron.