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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
Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?
Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the Periodic Table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why?
Which of the following statement is correct in regard to the classification of elements?
(a) Elements in modern periodic table are arranged on the basis of increasing atomic masses.
(b) Elements in Mendeleev's periodic table are arranged on the basis of increasing atomic numbers.
(c) In modern periodic table, the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass.
(d) In modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group.
Which element has two shells, both of which are completely filled with electrons?
On the basis of electronic configuration, how will you identify chemically similar elements?
What is the number of elements is 1st period the modern periodic table?
Which of the following are the correct characteristics of isotopes of an element?
(i) same atomic mass
(ii) same atomic number
(iii) same physical properties
(iv) same chemical properties
(a) (i), (ii) and (iv)
(b) (ii), (iii) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)
State the term
The tabular arrangement of elements in horizontal rows and vertical columns _________
Correct the statement.
Copper and zinc are representative elements.
Correct the statement.
Transition elements are placed at extreme right of the periodic table.
Name two elements in halogens.
Name two elements in each case:
Actinides
Arrange the elements of second and third periods in increasing order of their atomic size.
Third Period.
An element barium has the atomic number 56. Look up its position in the periodic table and answer the following question.
Is it larger or smaller than caesium (Cs)?
State the modern periodic law for the classification of elements. How many (i) groups and (ii) periods are there in the modern 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.
Answer the following question.
How it can be proved that the basic structure of the Modern Periodic Table is based on the electronic configuration of atoms of different elements?
Give the symbol and valency of the following element and radical.
Hydrogen
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]
What are the periods in a periodic table?
Find the correlation:
Group 1 and 2 : s block : : group 13 and 18 : ______
Write an explanation.
Period
Write a scientific reason.
There was ambiguity about the correct position of hydrogen in Mendeleev’s periodic table.
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.
The scientist who propounded the modern periodic law 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 statements about the Modern Periodic Table is correct:
Which one of the following elements exhibit maximum number of valence electrons?
Arrange the following elements in the increasing order of their metallic character
| Mg, | Ca, | K, | Ge, | Ga |
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 same valency as Lithium.
______ group elements are called alkaline earth metals.
Spot the error:
The elements of group 13 are called the carbon family.
An element belonging to 3d series of modern periodic table has spin magnetic moment = 5.92 B.M. in +3 oxidation state. The atomic number of elements are ______.
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.
State the group and period, of the element having three shells with three electrons in valence shell.
Name the non-metals in the first twenty elements.
