Answer:
Sodium - D) Malleable, soft, and shiny
Sodium is an alkalyne metals that is why they are soft and sodium can cut by knife.
Silicon - C) Has properties of both metals and nonmetals
As we know that those materials have both nonmetals and metals properties are known as metaloid.
Bromine - A) Highly reactive gas
All halogens are so reactive .Because they are high electro negative element.Bromine(Br) is a halogen element.
Argon - B) Nonreactive gas
All noble gases are stable that is why they are not reactive with ant other element.So we can say that noble gas are Nonreactive gas.Argon(Ar) is noble gas.
