Question

In the periodic table the highly electronegative halogens and highly electropositive alkali metal are separated by noble gas

Answer 1

Answer:

highly negative halogens require only one electron to complete their octat

noble gases are who ,whose octat is complicated

alkli metal have only one extra electron in their outer most element

they want to lose it to complete octat

hence , halogen and alkali metals separated by noble gas

Answer 2

As we know alkali metals are the first group element which loses one electron to form electropositive atom while halogens being seventeenth group element need one electron to form electronegative atom . They do so to attain nearest noble gas configuration. Thus we can say noble gas seperate alkali metals and halogens.

Eg. Fluorine is a halogen and sodium is a alkali metal fluorine gain one electron to form an nearest neon gas configuration while sodium lose one electron to form nearest neon noble gas configuration . This can be applied to all alkali metals and halogens.

Halogen - Noble gas - Alkali metal