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प्रश्न
Write the merits of the modern periodic table over Mendeleev’s Periodic table
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उत्तर
1) Elements are arranged on the basis of increasing atomic number which is more fundamental.
2) Isotopes of an element can be placed along with parent element.
3) It explains periodicity of properties of elements configuration.
4) Lanthanides and actinides are placed separately.
5) Anomalous pairs of elements like Ar and K having same atomic mass could be justified
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संबंधित प्रश्न
Fill in the blank:
The modern periodic table consists of ……………. periods.
Write the names given to the vertical columns and horizontal rows in the Modern Periodic Table. How does the metallic character of elements vary on moving down a vertical column? How does the size of atomic radius vary on moving left to right in a horizontal row? Give reason in support of your answer in the above two cases.
How does the metallic character of elements in Modern Periodic Table vary on moving from left to right in a period, and (ii) down a group?Give reason to justify your answer.
How does the tendency of elements to gain electrons change as we move from left to right in a period? State the reason of this change.
The modern periodic table was prepared by ______.
Explain why All the elements of a group have similar chemical properties.
What is a period in a periodic table?
Consider the following elements:
20Ca, 8O, 18Ar, 16S, 4Be, 2He
Which of the above elements would you expect to be:
(i) very stable?
(ii) in group 2 of the periodic table?
(iii) in group 16 of the periodic table?
Give the group number of following elements present in periodic table
Name two elements in each case:
Transition element
What do you understand by typical elements?
Name the type of elements which have two electrons in the outermost orbit.
How does the electronic configuration of an atom relate to its position in the modern periodic table?
Answer the following in respect of element `31/15 P`
Give its electronic configuration
Fill in the blank:
The horizontal rows in the periodic table are called _____________.
What is meant in the periodic table by a period?
Give the symbol and valency of the following element and radical.
Calcium
Give the symbol and valency of the following element and radical.
Aluminium
Give the symbol and valency of the following element and radical.
Magnesium
Give the symbol and valency of the following element and radical.
Chlorine [Chloride]
Give the symbol and valency of the following element and radical.
Bicarbonate
Give the chemical formula of magnesium nitrate
State the number of elements in Period 2 of the Periodic Table.
The groups 1 and 2 constitute the _______ block.
Complete the following flow chart.
The scientist who propounded the modern periodic law is ______.
The element which has the least tendency to lose electrons is ______
The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?
Which of the following elements does not lose an electron easily?
Choose an element from period 3 of modern periodic table that matches the description given below in instance. Give a reason for your choice.
It has a similar structure to diamond.
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 |
Write the molecular formula of the compound formed by the combination:
E and B
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 Noble gas?
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?
An element ‘M' has 50% of the electrons filled in the 3rd shell as in the 2nd shell. The atomic number of ‘M’ is ______.
Name the following metal:
A metal present in period 3, group 1 of the periodic table.
Answer the following in respect of element \[\ce{_16^32S}\].
Give its formula with hydrogen.
