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प्रश्न
The elements of one short period of the periodic table are given below in order from left to right:
| Li | Be | B | C | O | F | Ne |
One element of this period is missing. Which is the missing element and where should it be placed?
उत्तर
Nitrogen and it should be placed after carbon before oxygen.
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संबंधित प्रश्न
Calcium is an element with atomic number 20. Stating reason, answer each of the following questions:-
(i) Is calcium a metal or a non-metal?
(ii) Will its atomic radius be larger or smaller than that of potassium with atomic number 19?
(iii) Write the formula of its oxide.
Based on the group valency of elements state the formula lot the following giving justification for each :-
(i) Oxides of 1st group elements,
(ii) Halides of the elements of group 13, and
(iii) Compounds formed when an element of group 2 combines with, an element of group 16.
The correct increasing order of the atomic radii of the elements oxygen, fluorine and nitrogen is:
(a) O, F, N
(b) N, F, O
(c) O, N, F
(d) F, O, N
Name the element of lower nuclear charge out of Be and Mg.
What is meant by periodicity of elements?
Explain
Size of atom changes when it loses or gain electron
Select the correct answer
Most reactive character among the elements given below is found in
The position of elements A, B, C, D and E in the periodic table are shown below:
|
Group 1 |
Group 2 |
Group 17 |
Group 18 |
|
|
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D |
|
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B |
C |
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|
A |
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E |
State which is most reactive (i) metal (ii) non-metal
Select the correct answer from the options given below.
Is the group number of the element whose atomic number is 4.
State the following:
The group to which the element with an electronic configuration of 2, 8, 2 belongs.
