Question

Atoms of seven elements A, B, C, D, E, F and G have a different number of electronic
shells but have the same number of electrons in their outermost shells. The elements A and
C combine with chlorine to form an acid and common salt respectively. The oxide of
element A is a liquid at room temperature and is a neutral substance, while the oxides of the
remaining six elements are basic in nature. Based on the above information answer the
following questions:
(i) What could the element A be?
(ii) Will elements A to G belong to the same period or same group of the periodic table?
(ii) Write the formula of the compound formed by the reaction of element A with
oxygen.
(iv) Show the formation of the compound by a combination of element C with chlorine
With the help of an electronic structure.
What would be the ratio of the number of combining atoms in a compound formed by​

Answer 1

Answer:

FgExplain giving justification the trends in the following properties of elements, on moving from left to right in a period, in the Modern periodic Table.

Variation of valency.

Change of atomic radius.

Metallic to non-metallic character.

Electronegative character.

Nature of oxides.

Answer

a) Valency first increases, then decreases

b) Decreases

c) Increases

d) Increases

e) Changes from basic to acidic