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प्रश्न
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 |
|
|
|
|
D |
|
|
B |
C |
|
|
A |
|
|
E |
State which is most reactive (i) metal (ii) non-metal
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उत्तर
Most reactive
(i) Metals: Alkali metals (Group I); Caesium
(ii) Non-metals: Halogens (Group 17); Fluorine
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संबंधित प्रश्न
An element 'X' has mass number 35 and number of neutrons 18. Write atomic number and electronic configuration of 'X'. Also write group number, period number and valency of 'X'.
Write the number of vertical columns in the modern periodic table. What are these columns called?
Which element has a total of three shells, with four electrons in its valence shell?
Which element has twice as many electrons in its second shell as in its first shell?
Arrange the following elements in increasing order of their atomic radii:
Li, Be, F, N
Why do elements in the same group show similar properties but the elements in different groups show different properties?
In which part of a group would you separately expect the elements to have the largest atomic size?
Why are noble gases placed in a separate group?
The electronic configuration of an element is 2, 8, 4. State it:
name and write its one physical property.
The position of certain elements in the Modern Periodic Table is shown below:
| Group → Period ↓ |
1 | 2 | 3 to 12 | 13 | 14 | 15 | 16 | 17 | 18 |
| 1 | G | H | |||||||
| 2 | A | I | B | C | |||||
| 3 | D | E | F |
Using the above table answer the following questions giving reasons in each case:
- Which element will form only covalent compounds?
- Which element is a non-metal with valency 2?
- Which element is a metal with valency 2?
- Out of H, C, and F which has the largest atomic size?
- To which family does H, C, and F belong?
