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(a) An element X has mass number 40 and ...

(a) An element `X` has mass number 40 and contains 21 neutrons in its atom. To which group of the periodic table does it belong?
(b) The element `X` forms a compound `X_(2)Y`. Suggest an element that `Y` might be and give reasons for your choice.

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The correct Answer is:
(a) Group 1 (b) Oxygen (`X` is monovalent so `Y` has to be divalent to form the compound `X_(2)Y`)
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LAKHMIR SINGH & MANJIT KAUR-PERIODIC CLASSIFICATION OF ELEMENTS-Exercise
  1. An element X is in group of the periodic table: (a) What will be the...

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  2. An element Y is in second period and group 16 of the periodic table: ...

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  3. (a) An element X has mass number 40 and contains 21 neutrons in its at...

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  4. An element X combines with oxygen to form an oxide XO. This oxide is e...

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  5. An element A has an atomic number of 6. Another element B has 17 elect...

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  6. The elements A,B,C and D belong to groups 1,2,14 and 17 respectively o...

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  7. An element X from group 2 reacts with element Y from group 16 of the p...

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  8. A metal X is in the first group of the periodic table. What will be th...

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  9. An element A from group 14 of the periodic table combines with an elem...

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  10. An element X from group 2 of the periodic table reacts with an elemen...

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  11. The following diagram shows a part of the periodic table containing f...

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  12. The elements A,B and C belong to groups 1,14 to 17 respectively of the...

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  13. Find the neutral atom in the periodic table which has the same number ...

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  14. Write the names and symbols of two very reactive metals belonging to g...

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  15. The non-metal A is an important constituent of our food and most of th...

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  16. A non metal X which is the largest constituent of air combines with hy...

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  17. Solid sodium bicarbonate was placed on a strip of pH paper. The colour...

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  18. When dilute hydrochloric acid is added to granulated zinc placed in a ...

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  19. When an aluminium strip is kept immersed in freshly prepared ferrous s...

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  20. The description which most approximately suits sulphur dioxide gas is ...

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