Question

Atoms of eight elements—A, B, C, D, E, F, G and H—have the same number of electrons in their outermost shell. Elements A and G combine to form an ionic compound. This ionic compound is added to a small amount of almost all vegetables and dishes during cooking. Oxides of elements A and B are basic in nature, while those of elements E and F are acidic. However, the oxide of element D is almost neutral. Based on the above information, answer the following questions:

(i) To which group or period of the periodic table do these elements belong?
(ii) What would be the nature of the compound formed by a combination of elements B and F?
(iii) Which two of these elements could definitely be metals?
(iv) Which one of the eight elements is most likely to be found in the gaseous state at room temperature?
(v) If the number of electrons in the outermost shell of elements C and G are 3 and 7, respectively, write the formula of the compound formed by the combination of C and G.

Answer 1

....jhemmsmdmmdm dnmsm s. s

Answer 2

i). all elements belong to 3 period

A

group 1

B

group 2

C

grp 3

D

grp14

E

grp15

F

grp16

G

grp17

H

grp18

ii)ionic

iii)metals

iv)H is more gaseous

iv)CG3

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