AP BIOLOGY

Detailed explanation-1: -The number of electrons in the outermost shell of a particular atom determines its reactivity, or tendency to form chemical bonds with other atoms. This outermost shell is known as the valence shell, and the electrons found in it are called valence electrons.

Detailed explanation-2: -Answer and Explanation: The factor that determines whether or not two atoms will bond to form a molecule is their number of valence electrons. Valence electrons are those that orbit in the outermost energy level of an atom. Most atoms need eight valence electrons in order to be stable and nonreactive.

Detailed explanation-3: -How do you find the valence electrons? For neutral atoms, the number of valence electrons is equal to the atom’s main group number. The main group number for an element can be found from its column on the periodic table. For example, carbon is in group 4 and has 4 valence electrons.

Detailed explanation-4: -Valence electrons are the electrons that are the furthest away from the nucleus, and thus experience the least attraction from the nucleus and therefore are most reactive. They play the most important role in chemical bonding.

Detailed explanation-5: -Valence electrons are important because they determine how an atom will react. By writing an electron configuration, you’ll be able to see how many electrons occupy the highest energy level. The electron configuration can be determined from where the atom is located in the periodic table and by using the spdf chart.