Question

Atoms of eight elements A, B, C, D, E, F, G and H have the same number of
electronic shells but different number of electrons in their outermost shell. It
was found that elements A and G combine to form an ionic compound. This
compound is added in a small amount to almost all vegetable dishes during
cooking. Oxides of elements A and B are basic in nature while those of E and
F are acidic. The oxide of D is almost neural.
(i) To which group or period of the periodic table do the listed elements
belong?
(ii) What would be the nature of compound formed by a combination of
elements B and F?
(iii) Which two of these elements could definitely by metals?
(iv) Which one of the eight elements is most likely to be found in gaseous
state at room temperature?
(v) If the number of electrons in the outermost shell of elements C and G
3and 7 respectively, write the formula of the compound formed by
the combination of C and G.

Answer 1

(i) the elements belong to period 3 and the compound A and G is of salt NaCl
You can find rest of the answers with the help of a periodic table.

Answer 2

Third period

Group—1, 2, 13, 14, 15, 16, 17, 18 respectively.

Nature of compound: Electrovalent/ionic.

Metals—A and B; Non-metals—E, F, G

G/H

CG3