Question

what is halogen?please answer correct​

Answer 1

The halogens are a group in the periodic table consisting of five chemically related elements: fluorine, chlorine, bromine, iodine (I), and astatine. The artificially created element 117, tennessine, may also be a halogen. In the modern IUPAC nomenclature, this group is known as group 17.

CAS group number (US, pattern A-B-A): VIIA

IUPAC group number: 17

Old IUPAC number (Europe, pattern A-B)

Answer 2

Answer:

The halogens are a group in the periodic table consisting of five chemically related elements: fluorine, chlorine, bromine, iodine (I), and astatine. The artificially created element 117, tennessine, may also be a halogen. In the modern IUPAC nomenclature, this group is known as group 17

Explanation:

CAS group number (US, pattern A-B-A): VIIA

IUPAC group number: 17

Old IUPAC number (Europe, pattern A-B): VIIB