Question

Which of the following group elements contains solid, liquid, and gas phases at 298 K and 1 atm?
(A) 18
(B) 2
(C) 17
(D) 16
(E) 1

Answer 1

Hint: A group is a column of elements in the periodic table of chemical elements in chemistry. The periodic table has 18 numbered groups; the f-block columns are not numbered. Because most chemical properties are determined by the orbital position of the outermost electron, elements in a group have comparable physical or chemical features of their atoms' outermost electron shells (i.e., the same core charge).

Complete answer:
The halogens are a set of five chemically related elements in the periodic table: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (A) (At). Tennessine (Ts), an artificially manufactured element, may also be a halogen. This group is designated as group 17 in contemporary IUPAC nomenclature. At ordinary temperature and pressure, the halogens are the only periodic table group that contains elements in three of the major states of matter. When halogens are linked to hydrogen, they all produce acids. The majority of halogens are produced from minerals or salts. Chlorine, bromine, and iodine, the middle halogens, are frequently employed as disinfectants. The most common type of flame retardant is organic bromides, but elemental halogens are hazardous and can be fatal.
There are three types of halogens:
-Fluorine, Chlorine, Bromine, Iodine, Astatine, and Tennessine are the elements fluorine -elements fluorine and chlorine are both gases.
-Bromine is a liquid substance.
-The remaining three are solids at normal temperature.
Hence option C is correct.

Note:
Solid, liquid, and gas are the three states of matter. Solids have a definite volume and shape. Liquids have a defined volume, yet they conform to the shape of the container. Gases do not have a distinct shape or volume. The word "halogen" literally means "salt-producing." When halogens react with metals, a variety of salts are produced, including calcium fluoride, sodium chloride (table salt), silver bromide, and potassium iodide.