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 shells. It was found that elements A and G combine to form an ionic compound which can also be extracted from sea water. Oxides of the elements A and B are basic in nature while those of E and F are acidic. The oxide of element D is almost neutral.
Answer the following questions based on the information given herein:
1. To which group or period of the periodic table do the listed elements belong?
2. Which one of the eight elements is likely to be a noble gas?
3. Which one of the eight elements would have the largest atomic radius?
4. Which two elements amongst these are likely to be non-metals?
5. Which one of these eight elements is likely to be a semi-metal or metalloid?
1. A and B belong to group 1 and 2 because they form basic oxides. C belongs to group 13 as it has 3 valence electrons. D belongs to group 14 as it forms almost neutral oxide. E and F belong to group 15 and 16 as they form acidic oxides, G belongs to group 17 as it has 7 valence electrons and H belongs to group 18. They belong to 3rd period of Periodic Table because sodium belongs to 3rd period and AG is NaCl, ionic compound of sodium which can be obtained from sea water and A(Na) and G(CI) belong to 3rd period.
2. H belongs to noble gas.
3. A has the largest atomic radius.
4. E and F are likely to be non-metals.
5. D is likely to be metalloid or semi-metal.