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प्रश्न
Write the number of vertical columns in the modern periodic table. What are these columns called?
उत्तर
There are 18 vertical columns in the modern periodic table and these are known as groups.
संबंधित प्रश्न
From the following elements :
4Be; 9F; 19K; 20Ca
(i) Select the element having one electron is the outermost shell.
(ii) two elements of the same group.
Write the formula of and mention the nature of the compound formed by the union of 19K and element X(2, 8, 7).
Write the atomic numbers of two elements 'X' and 'Y' having electronic configuration 2, 8, 2 and 2, 8, 6 respectively.
What happens to the metallic character of the elements as we go down in a group of the periodic table?
Name the element which is in first group and third period.
Arrange the following elements in the increasing order of their metallic character:
Mg, Ca, K, Ga
Which element has:
twice as many electrons in its second shell as in its first shell?
In the following table, the positions of six elements A, B, C, D, E and F are given as they are in the Modern Periodic Table :
 |
1 | 2 | 3-12 | 13 | 14 | 15 | 16 | 17 | 18 |
| 2 | A | B | C | D | |||||
| 3 | E | F |
On the basis of the above table, answer the following questions :
(i) Name the element which forms only covalent compounds.
(ii) Name the element which is a metal with valency three.
(iii) Name the element which is a non-metal with valency three.
(iv) Out of B and C, whose atomic radius is bigger and why ?
(v) Write the common name for the family to which the elements D and F belong.
Fill in the blank
Most electropositive elements belong to ______ group.
Moving left to right in the second period, the number of valence electrons _____.
Electron Affinity is maximum in ______.
