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प्रश्न
Fill in the blank:
The modern periodic table consists of ……………. periods.
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उत्तर
The modern periodic table consists of 7 periods.
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संबंधित प्रश्न
Fill in the following blank with suitable word:
Group 17 elements are known as ...............
What is meant by a group, in a periodic table?
What is meant by a period, in a periodic table?
Name the scientist who prepared modern periodic table.
Consider the following elements:
Na, Ca, Al, K, Mg, Li
Which of these elements belong to the same group of the periodic table?
Which element has the electronic configuration 2, 8, 2?
What is the usual number of valence electrons in the atoms of the last element in a period?
Name the metals in the first twenty elements.
The electronic configuration of an element T is 2, 8, 8, 1.
What is the period number of T?
Name an alkali metal in period 3 and halogen in period 2.
Name the noble gas with 3 shells.
Write a short note.
Structure of the modern periodic table.
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.
Chlorine [Chloride]
Give the symbol and valency of the following element and radical.
Ammonium
Give the symbol and valency of the following element and radical.
Bisulphite
Give the symbol and valency of the following element and radical.
Carbonate
Give the chemical formula of ammonium sulphate
Give the chemical formula of carbonic acid
Give the chemical formula of calcium phosphate
The modern periodic table has 1 to 7 periods.
An X element with atomic number 11 and Y element with atomic number 13 belongs to the third period in the modern periodic table. With this information, give the answers of the below questions.
- Which element has more metallic character from these two elements?
- What is the valency of each X and Y elements?
- Atom size of Y element is smaller than atom size of X element. Explain.
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.
The arrangement of elements in the Modem Periodic Table is based on their ______
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?
“Hydrogen occupies a unique position in Modern Periodic Table”. Justify the statement.
Define groups of 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.
1H2 is an isotope of hydrogen. In the modern Periodic Table it will ______.
Name two elements that you would expect to show chemical reactions similar to calcium. What is the basis of your choice?
Match the atomic number with the following:
An element of group 2.
Give reason for the following:
Inert gases do not form ion.
