Simplify the following text for a Grade 11 native English-speaking person.
Original: The halogens or halogen elements are a series of nonmetal elements from Group 17 IUPAC Style ( formerly : VII , VIIA ) of the periodic table , comprising fluorine ( F ) , chlorine ( Cl ) , bromine ( Br ) , iodine ( I ) , and astatine ( At ) .
Simplified: The halogens are chemical elements under the second-to-right column in the periodic table , also known as Group 17 . The elements in the group are fluorine , chlorine , bromine , iodine , astatine , and ununseptium .