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Find the neutral atom in the periodic ta...

Find the neutral atom in the periodic table which has the same number of electrons as `K^(+)` and `Cl^(-)` . What is this number?

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The correct Answer is:
Argon atom, 18 electrons
NA
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LAKHMIR SINGH & MANJIT KAUR-PERIODIC CLASSIFICATION OF ELEMENTS-Exercise
  1. The following diagram shows a part of the periodic table containing f...

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

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

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

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

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

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

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

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

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

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  11. Ethanoic acid was added in drops to water and it was noticed that :

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  12. A colourless liquid sample was tested with pH paper strip. The colour ...

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  13. Ehanoic acid was added to sodium hydrogencarbonate solution and the ga...

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  14. Which one of the following set ups is the most apropriate for the evol...

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  15. Four students A,B,C and D noted the initial colour of the solutions in...

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  16. Four gas jars filled with sulphur dioxide gas wer inverted into trough...

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  17. The colour of the pH strip turned red when it was dipped into a sample...

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  18. A drop of colourless liquid was placed on blue litmus paper. The litmu...

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  19. A piece of granulated zinc was dropped into copper sulphate solution. ...

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  20. When sulphur dioxide gas is passed throught acidified potassium dichro...

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