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प्रश्न
Define groups of modern periodic table.
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उत्तर
In the modern periodic table, groups (also known as families) are the 18 vertical columns that organize chemical elements by shared properties. Unlike periods, which are horizontal rows representing electron shells, groups are vertical columns of elements with similar chemical properties.
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संबंधित प्रश्न
How does the electronic configuration of an atom relate to its position in the Modern Periodic Table?
In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21, and 38. Which of these have physical and chemical properties resembling calcium?
What is periodicity in properties of elements with reference to the Modern Periodic Table?
What is meant by a group, in a periodic table?
Give two example of group 1 elements.
The three elements having chemical symbols of Si, B and Ge are:
(a) all metals
(b) all non-metals
(c) all metalloids
(d) Si is metalloid, B is metal and Ge is non-metal
Give alongside is a part of the periodic table :
As we move horizontally from left to right:
| Li | Be | B | C | N | O | F | |
| Na | Mg | Al | Si | P | S | Cl |
(i) What happens to the metallic character of the elements?
(ii) What happens to the atomic size?
How would the tendency to gain electrons change on moving from left to right in a period of the periodic table?
What is the usual number of valence electrons in the atoms of the last element in a period?
On the basis of electronic configuration, how will you identify chemically similar elements?
What happens to the number of valence electrons in the atoms of elements as we go down in a group of the periodic table?
Explain why, the first period of the periodic table has only two elements whereas second period has eight elements
What is the main characteristic of the last elements in the periods of the periodic table? What is the general name of such elements?
Correct the statement.
Transition elements are placed at extreme right of the periodic table.
Name the type of elements which have outermost shell complete.
Name the type of elements which have two outermost shell incomplete.
Answer the following in respect of element `31/15 P`
Give its electronic configuration
Give the symbol and valency of the following element and radical.
Nitrate
Fill in the blank:
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The groups 1 and 2 constitute the _______ block.
The modern periodic table is divided into which blocks?
Write scientific reason.
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In the modern periodic table, the positions of 1 to 20 elements are shown here. Identify the elements A and B. Write their atomic number.
Distinguish between:
Group 17 - Group 18
Position of A, B and C three elements is given in the table from the modern periodic table. Answer the following questions.
| Periods | Group 2 | Group 17 |
| 2 | ----- | A |
| 3 | B | ----- |
| 4 | ----- | C |
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- Which is the outermost orbit of element B?
- Identify C element and it's physical state.
State whether true or false. If false, correct the statement.
Lanthanides and actinides are kept at the bottom of the periodic table because they resemble each other but they do not resemble with any other group elements.
Identify gas A in the following experiment.
Element ‘X’ forms a chloride with the formula XCl2, which is solid with a high melting point. X would most likely be in the same group of the periodic table as: ______
The inert gas which lies in the third period is ______
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It has a similar structure to diamond.
Group 16 elements are collectively called as ______.
Spot the error:
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A part of modern periodic table is given below. On its basis, answer the following questions:
| Group No. → | 1 | 2 | 13 | 14 | 15 | 16 | 17 | 18 |
| Period ↓ | ||||||||
| 2 | A | B | ||||||
| 3 | E | D | F | C |
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A part of modern periodic table is given below. On its basis, answer the following questions:
| Group No. → | 1 | 2 | 13 | 14 | 15 | 16 | 17 | 18 |
| Period ↓ | ||||||||
| 2 | A | B | ||||||
| 3 | E | D | F | C |
Which of the element is a Metalloid?
Give the criteria on the basis of which elements are placed (i) in a group and (ii) in a period in the modern periodic table. The atomic number of an element is 16. According to the criteria, in which group and period it should be placed?
State the group and period, of the element having three shells with three electrons in valence shell.
An element has 2 electrons in its N shell.
State its position in periodic table.
