Question

a halogen that reacts with sodium to form salt. a non - metal used in computer chips a highly reactive alkali metal a noble gas with 2 protons

Explanation:

1. Chlorine (a halogen) reacts with sodium to form sodium - chloride (common salt).
2. Silicon is a non - metal widely used in computer chips due to its semiconductor properties.
3. Potassium is a highly reactive alkali metal, more reactive than sodium in the alkali metal group.
4. Helium is a noble gas with an atomic number of 2, meaning it has 2 protons.

Answer:

1. Chlorine
2. Silicon
3. Potassium
4. Helium