plz..give ans...of these ques..
Answers
Explanation:
A))))
hydrogen, helium, lithium ....
B)))) Most Group 8 or 18 elements that appear in the last column of the periodic table (Helium, Neon, Argon, Krypton, Xenon and Radon) are classified as inert (or unreactive). These elements are stable in their naturally occurring form (gaseous form) and they are called inert gases.
C)))) 17: The Halogens. The halogens are located on the left of the noble gases on the periodic table. These five toxic, non-metallic elements make up Group 17 of the periodic table and consist of: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).
Answer:
Explanation:
c) group 1 of periodic table i.e alkali metals and group 17 i.e halogen shows valency of one. as in group one their valence electron is one so they can lose one electron to attain the nearest noble gas configuration. similarly group 17 needs only one electron so it gains one electron to attain the nearest noble gas configuration.
d) noble gas i.e group 18 is chemically inert because their outer shell contains fully filled orbitals so they do not take part in chemical reaction. however xenon can form some compound.
e) group 17 is halogen family it includes:
F, Cl, Br, I, At
they are called halogens because they mostly form salts. "halo" means salt and "gen" means forming.