Given a sentence, fill out the missing word with a 'no' or a number (between zero and ten). You should write the numbers with english alphabet, like: four instead of 4.
--------
Question: Carbon atoms are tetravalent, and therefore, can have ____ bonding pairs around each carbon atom.

Answer: four


Question: Cleavage is perfect in ____ directions forming rhombs.

Answer: three


Question: Carbon can bond to a maximum of ____ atoms.

Answer:
four