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प्रश्न
How many rows and columns are there in the modern periodic table?
Write the number of periods and groups in the modern periodic table.
Answer the following sub-question regarding the modern periodic table:
Write the number of periods and groups.
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उत्तर
In the modern periodic table, there are 18 vertical columns known as groups and 7 horizontal rows known as periods.
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संबंधित प्रश्न
The position of three elements A, B and C in the Periodic Table are shown below –
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Group 16
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Group 17
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A
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B
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C
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(a) State whether A is a metal or non-metal.
(b) State whether C is more reactive or less reactive than A.
(c) Will C be larger or smaller in size than B?
(d) Which type of ion, cation or anion, will be formed by element A?
Compare and contrast the arrangement of elements in Mendeleev’s periodic Table and the Modern Periodic Table.
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.
Fill in the following blank with suitable word:
The horizontal rows in a periodic table are called ...............
Which of the following statement about the modern periodic table is correct?
(a) It has 18 horizontal rows known as periods.
(b) It has 7 vertical columns known as periods.
(c) It has 18 vertical columns known as groups.
(d) It has 7 horizontal rows known as groups.
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?
What is the main characteristic of the last elements in the periods of the periodic table? What is the general name of such elements?
What are the periods in a periodic table? Give two characteristics of each.
An element X belongs to 3rd period and group 2 of the periodic table. State:
(a) number of valence electrons
(b) valency
(c) metal or non-metal
(d) name of the element
State the term
The tabular arrangement of elements in horizontal rows and vertical columns _________
Name the scientist who stated the modern periodic law.
Name two elements in each case:
Transition element
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 _____________.
State the modern periodic law for classification of elements. How many (i) groups and (ii) periods are there in the modern periodic table?
How will the tendency to gain electrons change as we go from left to right across a period? Why?
Write a short note.
Structure of the modern periodic table.
What would be the correct order if Zn, Fe, Al and Cu are arranged in increasing order of reactivity?
How does number of (i) valence electrons (ii) valency; vary on moving from left to right in the second period of a periodic table?
Name and state the following with reference to the elements of the first three periods of the periodic table.
A covalent compound formed by an element in period 2 and a halogen.
Name the cation and the anion in the salt – calcium sulphate
Give the symbol and valency of the following element and radical.
Nitrogen [Nitride]
Give the symbol and valency of the following element and radical.
Nitrate
Give the symbol and valency of the following element and radical.
Bisulphate
Give the symbol and valency of the following element and radical.
Sulphite
What are the periods in a periodic table?
Find the odd one out and give its explanation.
Distinguish between:
Group 17 - Group 18
State any five features of modern periodic table.
How does the property vary in periods and in groups?
The element which has the least tendency to lose electrons is ______
On moving from left to right in a period in the periodic table, the size of the atom ______
In the modern periodic table, elements are arranged according to their ______
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 given elements A, B, C, D and E with atomic number 2, 3, 7, 10 and 30 respectively belong to the same period?
Which of the following elements would lose an electron easily?
Spot the error:
There are 5 periods and 17 groups in the modern periodic table.
Select the appropriate options and complete the following paragraph:
(metals, non-metals, metalloids, four, seven, s-block, p-block, d-block, f-block).
On the basis of electronic configuration, elements in the modern periodic table are classified Into ______ blocks. Groups 1 and 2 elements are included in ______ and all these elements are metals. (except Hydrogen). Group 13 to 18 elements are included in ______. This block contains metals, non-metals and metalloids. Group 3 to 12 elements are included in ______ and all the elements are ______ elements shown at the bottom of the periodic table i.e. Lanthanides and Actinides constitute ______ and all these elements are metals.
