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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 neutral. Based on the above information answer the following questions: (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 be 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 be 3 and 7 respectively, write the formula of the compound formed by the combination of C and G.


 (i) The elements A, B, C, D, E, F, G and H belong to the third period of the periodic table and to the following groups. A belongs to group 1 B belongs to group 2 C belongs to group 3 D belongs to group 14 E belongs to group 15 F belongs to group 16 G belongs to group 17 H belongs to group 18 (ii) The compounds formed by B and F would be ionic in nature. (iii) Elements A and B are definitely metals. (iv) Element H is most likely to found in gaseous state at room temperature. (v) The formula of the compound will be CG3.
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