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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 which can also be extracted from sea water. 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 compounds formed by a combination of elements B and F?
(iii) Which two of these elements could definitely be metals and which are likely to be non-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.
(vi) Which one of the eight elements is likely to be a noble gas?
(vii) Which one of the eight elements would have the largest atomic radius?
(viii) Which one of these eight elements is likely to he a semi-metal or metalloid?

1 Answer

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(i) Third period
Group-1 ,2,13,14, 15, 16, 17, 18 respectively.
(ii) Nature of compound: Electrovalent/ionic
(iii) Metals-A and B; Non-metals-E, F, G
(iv) G/H
(v) CG3
(vi) H
(vii) A
(viii) D

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