</span>In VIIA or group 17 (hologen elements) there are six elements: fluorine<span> (F), </span>chlorine<span> (Cl), </span>bromine<span> (Br), </span>iodine<span> (I), </span>astatine<span> (At).and </span>tennessin(<span>Ts). </span><span>They have high electronegativity because they have seven valence electrons in their outermost energy level, so they can gain an electron to have the </span>octet rule<span>. </span> Electronegativity<span> is
a chemical property that
describes the tendency of an atom to
attract a shared pair of electrons towards
itself. </span>
