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प्रश्न
Which of the following statements about the Modern periodic table is correct?
विकल्प
18 horizontal rows are known as Periods.
7 vertical columns are known as Periods.
18 vertical columns are known as groups.
7 horizontal rows are known as groups.
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उत्तर
18 vertical columns are known as groups.
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संबंधित प्रश्न
How many rows and columns are there in the Modem Periodic Table?
Fill in the following blank with suitable word:
Group 17 elements are known as ...............
Fill in the following blank with suitable word:
Group 18 elements are called ...............
What is meant by a group, in a periodic table?
Give two example of group 17 elements.
How were the positions of isotopes of an element decided in the modern periodic table?
The modern periodic table was prepared by ______.
The atomic particle whose number in the atoms of an element always remains the same and which forms the real basis for the modern classification of elements is:
(a) electron
(b) proton
(c) neutron
(d) meson
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 usual number of valence electrons in the atoms of the last element in a period?
From the standpoint of atomic structure, what determines which element will be the first and which the last in a period the periodic table?
What are horizontal rows and vertical columns in a periodic table known as?
Name two elements in each case: Lanthanides
What do you understand by typical elements?
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 would be the correct order if Zn, Fe, Al and Cu are arranged in increasing order of reactivity?
How many periods and groups are there in the modern periodic table?
The horizontal rows in a periodic table are called _____.
Give the symbol and valency of the following element and radical.
Bicarbonate
Give the symbol and valency of the following element and radical.
Sulphate
Fill in the blank:
The element lithium in the Modern Periodic Table with valency 1+ belongs to the group ______.
State the number of elements in Period 2 of the Periodic Table.
What are the periods in a periodic table?
Distinguish between:
Group 17 - Group 18
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.
State any five features of modern periodic table.
How does the property vary in periods and in groups?
Which of the following statements about the Modern Periodic Table is correct:
The three elements A, B and C with similar properties have atomic masses X, Y and Z respectively. The mass of Y is approximately equal to the average mass of X and Z. What is such an arrangement of elements called as? Give one example of such a set of elements.
“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?
Define periods of modern periodic table.
An element with atomic number ______ will form a basic oxide.
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.
What is the general name of the last elements of the Periodic Table?
Match the atomic number with the following:
An element of group 2.
