Alkali Metals are soft enough to be cut with a knife.Alkali Metals:LithiumSodiumPotassiumRubidiumCesiumFrancium
Mercury.
soapstone
Mercury.
Some metals, such as sodium and potassium, are soft enough to be cut with a knife. Nonmetals such as sulfur can also be cut with a knife due to their brittle nature. However, most metals and nonmetals are too hard to be cut with a knife.
Lithium and possibly sodium
Sodium is a metal element that is soft enough to be cut with a knife.
The elements at the far left of the periodic table are called the "alkali metals," which are soft enough to be cut with a knife and reactive enough you'll never find them in nature as pure elements, only as salts.
Metals that are relatively soft, such as lead, tin, or aluminum, can be cut with a knife. Harder metals like steel, stainless steel, or titanium are much more difficult to cut with a knife due to their strength and toughness.
Most of the Alkali metals are soft enough to be cut with a knife, certainly Sodium, Potassium and Rubidium are.
The fact that sodium metal is soft enough to cut with a butter knife is a physical property. This property describes a characteristic of the substance itself without changing its chemical composition.
Two examples of soft and brittle metals are lead and tin. Lead is a soft metal that can be easily cut with a knife, while tin is also soft but more brittle and can crumble easily.