EVERYDAY SCIENCE

Detailed explanation-1: -The Group 7A elements have seven valence electrons in their highest-energy orbitals (ns2np5). This is one electron away from having a full octet of eight electrons, so these elements tend to form anions having-1 charges, known as halides: fluoride, F-; chloride, Cl-, bromide, Br-, and iodide, I-.

Detailed explanation-2: -The elements in this family are fluorine, chlorine, bromine, iodine, and astatine. Halogens have 7 valence electrons, which explains why they are the most active non-metals.

Detailed explanation-3: -Chlorine has seven valence electrons.

Detailed explanation-4: -Because the halogen elements have seven valence electrons, they only require one additional electron to form a full octet. This characteristic makes them more reactive than other non-metal groups.

Detailed explanation-5: -Answer and Explanation: The group number in which the element belongs to is equal to the total number of valence electrons of that element. Therefore, as the halogens are all in group 7 of the periodic table, they all have 7 electrons in their outer shell.