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प्रश्न
An element which is an essential constituent of all organic compounds belongs to following group of modern periodic table:
(a) group 4
(b) group 14
(c) group 15
(d) group 16
उत्तर
(b) Group 14.
Carbon is the essential constituent of all organic compounds and belongs to Group 14 of the modern periodic table.
Electronic configuration of carbon (6): K L
2 4
Group number = valence shell+10
= 4+10 = 14.
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संबंधित प्रश्न
Taking the example of an element of atomic number 16, explain how the electronic configuration of the atom of an element relates to its position in the modern periodic table and how valency of an element is calculated on the basis of its atomic number.
List any two properties of the elements belonging to the first group of the modern periodic table.
Define the term : Valency
Write the number of horizontal rows in the modern periodic table. What are these rows called?
How does the number of valence electrons vary on moving from left or right in the first period of the periodic table?
Which one of the following does not increase while moving down the group of the periodic table?
In each of the following pair, choose the atom having the bigger size:
Na (At. No. 11) or K (At. No. 19)
State whether the following statement is true or false
Similar electronic configuration is repeated after intervals of 2, 8, 8, 18 and 32.
Parts (i) to (v) refer to changes in the properties of elements on moving from left to right across a period of the periodic table. For each property, choose the letter corresponding to the correct answer from the choices (a), (b), (c) and (d).
(i) The non metallic character of the elements:
(a) Decreases
(b) Increases
(c) Remains the same
(d) Depends on the period
(ii) The electro negativity
(a) Depends on the number of valence electrons
(b) Remains the same
(c) Decreases
(d) Increases
(iii) The ionization potential
(a) Goes up and down
(b) Decreases
(c) Increases
(d) Remains the same
(iv) The atomic size
(a) Decreases
(b) Increases
(c) Remains the same
(d) Sometimes increases and sometimes decreases
(v) The electron affinity of the elements in groups 1 to 7:
(a) Goes up and down
(b) Decreases and then increases
(c) Increases
(d) decreases
An element A has 2 electrons in its fourth shell. State:
its valency
