The correct answer is Sodium and potassium.
Key Points
- Sodium and Potassium metals are the two metals which are soft and can be cut with a knife.
- Both belong to Alkali metals [first group of periodic table]
- They are reactive metals.
- As the atomic size increases down the group, so the force of attraction between the valence electron and nucleus decreases.
- Metallic bonds are not strong.
- Potassium is softer than sodium.
Additional Information
- Mercury- In a liquid state at room temperature, It is unique as a metal.
- Mercury (Hg), also known as quicksilver.
- Atomic Number- 80
- Zinc- Related to low Melting group.
- Atomic Number- 30
- Symbol- Zn
- Tin- It is a soft silvery-white metal with a bluish tinge.
- Atomic Number- 50
- Symbol- Sn


