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प्रश्न
Fill in the blank in the following statement:
On moving form right to left in the second period, the number of valency electrons ...............
उत्तर
On moving from right to left in the second period, the number of valence electrons decreases.
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संबंधित प्रश्न
Study the following table in which positions of six elements A, B, C, D, E and F are shown as they are in the modern periodic table:
|
Group→
Period↓ |
1
|
2
|
3-12
|
13
|
14
|
15
|
16
|
17
|
18
|
| 2 | A | B | C | ||||||
| 3 | D | 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 D and E, which is bigger in size and why?
(v) Write the common name for the family to which the elements C and F belong.
How do the atomic size and metallic character of elements vary as we move :-
(a) down a group and
(b) from left to right in a period
How does the number of valence electrons vary on moving from left or right in the second period of the periodic table?
How do electronic configurations of elements change in second period of periodic table with increase in atomic numbers?
Fill in the blank in the following statement:
The tendency to gain an electron ............... on moving down in a group of the periodic table.
What is meant by periodicity of elements?
State whether the following statement is true or false
On moving horizontally across a period, number of valence electrons increases from one to eight.
An element A has 2 electrons in its fourth shell. State:
is it a metal or non-metal
Name the period which is the shortest period of the periodic table.
Select the correct answer from the options given below.
It is a metal in period 2 having electronic configuration 2, 1?
