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Write the number of vertical columns in ...

Write the number of vertical columns in the periodic table. What are these columns called?

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The number of vertical columns in the periodic table is 18.These columns are called groups.
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ZEN PUBLICATION-PERIODIC CLASSIFICATION OF ELEMENTS-ZEE ADDITIONAL QUESTIONS SECTIONS (VERY SHORT ANSWER (VSA) TYPE QUESTIONS)
  1. Write the atomic numbers of two elements X and Y having electronic con...

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  2. Account for the following: Elements of group 17 are monovalent.

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  3. Account for the following: Elements of group 18 are zerovalent.

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  4. Elements A, B, C, and D have atomic numbers 1, 8, 11, and 19 respectiv...

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  5. Out of the two elements X and Y which has a bigger atomic radius? (i...

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  6. Out of the two elements, potassium and sodium, which one can lose elec...

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  7. Mention the type of compounds formed between group 1 and group 17 elem...

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  8. Write the number of vertical columns in the periodic table. What are t...

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  9. Write the number of horizontal rows in the modern periodic table. What...

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  10. Predict the maximum number of valence electrons possible for atoms in ...

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  11. What is the nature of oxides formed by most of p - block elements ?

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  12. Explain the acidic character of oxide of elements down a group and acr...

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  13. Why hydrogen should be placed in group I ?

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  14. Out of Li and K which has strong metallic character?

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  15. List any two properties of the elements belonging to the first group m...

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  16. Write the formula used to determine the maximum numbers of electrons w...

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  17. Name the element and its valency which is having electronic configurat...

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  18. Lithium, sodium and potassium form a Dobereiner's triad. The atomic ma...

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  19. What do you mean by valency?

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  20. Sodium and potassium are placed in the same group of modern periodic t...

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