Explain urgentlydear experts:Which of these are: noble gases , halogens , alkali metals and elements with valency 4?

Explain urgentlydear experts:Which of these are: noble gases , halogens , alkali metals and elements with valency 4? p. The question refers to the elements of the periodic table with atomic numbers from 3 to 18. Some of the elements are shown in letters of the alphabet, but the letters are not the usual symbols of the elements. 3 A 13 K oo 4 B 14 L 5 c 15 M 6 D 16 N 7 E 17 O 9 10 11 12 8 18