Answer is potassium and sodium. They are in the same group and that means they have the same properties. They are all alkali metals

(aq) +

(aq) ⇒

The sum of total charges of the reactant = 3×(2+) + 2×(3-)
= 6 + (-6)
=0
Answer:Non-covalent bonds
Explanation:
The Non-covalent bonds are bonds such as van der Waals forces of attraction, the Hydrogen bonds, hydrophobic bonds and so on. The Non-covalent bonds are very important types of bonding in large biological molecules.
Just like the question says, the Non-covalent bonds, ''makes it possible for a macromolecule to interact with great specificity with just one out of the many thousands of different molecules present inside a cell".
Ionic bonding is also a Non-covalent bonding. They(Non-covalent bonds) helps in the stability of large macromolecules.