Select the correct answer from each drop-down menu. what causes atoms to form covalent bonds? in a covalent bond, two atoms are held together by the attraction between . the number of covalent bonds that an atom can form depends on the number of in the atom.

Explanation:

When pairs of electrons are shared by atoms the bond formed is called covalent bonds. The main reason behind the formation of these bonds are to achieve stability.

Sharing of electrons of different elements’ outermost layer of atoms takes place, also known as Valence Electrons the number of valence electrons not same for different elements so on sharing of electrons’ pairs present in the outermost shell both the atoms  of different elements can fill their requirements  thus the bonds  from this way are covalent bonds.

aquifers are bounded above and below by impermeable rock. the driving force of groundwater movement in confined aquifers is pressure, rather than gravity.

i think it's c. if you look search electronic symbol on google and then click on wiki it shows you a