Question

Elements having atomic numbers 3 to 18 are shown in the form of a table by using certain letters of the
alphabet : (these letters are not the usual symbols of these elements)

(a) Which of these is (i) a noble gas, (ii) a halogen, (iii) an alkali metal, and (iv) an element with valency 4?
(b) Write the formula of the compound formed when A reacts with F.
(c) Write the electronic configuration of element G.
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Answer 1

Answer:

(a)(i) G is a noble gas(Neon).

(a)(ii)F is a halogen(Chlorine).

(a)(iii)A is an alkali metal(Lithium).

(a)(iv)An element with valency 4 is D(Silicon).

(b)When A reacts with F(Lithium reacts with Chlorine) AF or Lithium chloride(LiCl) is formed.

(c)The electronic configuration of element G (Neon) is 2,8.

2 electons in K shell and 8 electrons in L shell.

You can also refer to the attached periodic table for further details.

Answer 2

atomic number 10 (neon)and 18(argon) are noble gas.

halogen - atomic no 9(fluorine) and 17 (chlorine)