A covalent bond firms when two (positive or negative or neutral) nuclei are held together by their common attraction for a shared pair of (protons or…

/in /by

A covalent bond firms when two (positive or negative or neutral) nuclei are held together by their common attraction for a shared pair of (protons or neutrons or electrons) 

Pick one answer from each of the brackets

"Get 15% discount on your first 3 orders with us"
Use the following coupon
FIRST15

Order Now