Answer: There are 2 elements in group 17 (fluorine and chlorine) that are gases at room temperature and standard pressure.
Explanation:
Group 17 elements are known as halogens. The general electronic configuration for the elements in this group is \(ns^2np^5\), where n = highest principle quantum number.
The elements belonging to this group are:
- Fluorine (F): It exist as a gas at room temperature and standard pressure
- Chlorine (Cl): It exist as a gas at room temperature and standard pressure
- Bromine (Br): It exist as a liquid at room temperature and standard pressure
- Iodine (I): It exist as a solid at room temperature and standard pressure
- Astatine (At): It exist as a solid at room temperature and standard pressure
Hence, there are 2 elements in group 17 (fluorine and chlorine) that are gases at room temperature and standard pressure.
