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प्रश्न
Write an explanation.
Period
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उत्तर
A period is a horizontal row in the periodic table where elements have the same number of electron shells and show a gradual change in properties across the row.
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संबंधित प्रश्न
Write the merits of the modern periodic table over Mendeleev’s Periodic table
Fill in the following blank with suitable word:
The horizontal rows in a periodic table are called ...............
Fill in the following blank with suitable word:
Group 17 elements are known as ...............
Would you place the two isotopes of chlorine, CI-35 and CI-37 in different slots because of their different atomic masses or in the same slot because their chemical properties are the same? Justify your answer.
Is it possible to have an element having atomic number 1.5 placed between hydrogen and helium?
The modern periodic table was prepared by ______.
Which element has two shells, both of which are completely filled with electrons?
How does the chemical reactivity of the halogens vary on going in group 17 of the periodic table?
Explain why all the elements of a group have similar chemical properties.
On the basis of electronic configuration, how will you identify the first element of a period?
What is the number of elements is 1st period the modern periodic table?
Name two elements in Alkali metals.
Arrange the elements of second and third periods in increasing order of their atomic size.
Third Period.
What is the main characteristic of the last element in each period of the periodic table?
An element barium has atomic number 56. Look up its position in the periodic table and answer the following question.
What will be the formula of its phosphate?
State the modern periodic law for the classification of elements. How many (i) groups and (ii) periods are there in the modern periodic table?
An element E has following electronic configuration:
|
K |
L |
M |
|
2 |
8 |
6 |
(a) To which group of the periodic table does element E belong?
(b) To which period of the periodic table does element E belong?
(c) State the number of valence electrons present in element E.
(d) State the valency of the element E.
What is the number of elements in the 3rd period, of the modern periodic table?
Give the symbol and valency of the following element and radical.
Potassium
Give the symbol and valency of the following element and radical.
Calcium
Give the symbol and valency of the following element and radical.
Nitrogen [Nitride]
Give the symbol and valency of the following element and radical.
Carbonate
Name the following:
The group of the Modern Periodic Table to which calcium [Ca2+] belongs.
State the number of elements in Period 3 of the Periodic Table.
Noble gases belong to______ group of the periodic table.
What are groups and periods in the modern periodic table?
Identify gas A in the following experiment.
Which of these belong to the same period?
| Element | A | B | C |
| Atomic number | 2 | 10 | 5 |
The amount of energy released when one or more electrons is added to the neutral atom is ______
Where would you locate the element with electronic configuration 2,8 in the Modern Periodic Table?
“Hydrogen occupies a unique position in Modern Periodic Table”. Justify the statement.
If an element X is placed in group 14, what will be the formula and the nature of bonding of its chloride?
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.
Explain the position of hydrogen in the periodic table.
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?
Explain giving reason why although the nuclear charge in atoms increases in moving from left to right in a period as well as in moving from top to bottom in a group in the Modern periodic table, but the size of the atoms does not vary similarly in both situations.
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?
Define groups of modern periodic table.
