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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
How were the positions of isotopes of an element decided in the modern periodic table?
How were the positions of cobalt and nickel resolved in the modern periodic table?
The three elements having chemical symbols of Si, B and Ge are:
(a) all metals
(b) all non-metals
(c) all metalloids
(d) Si is metalloid, B is metal and Ge is non-metal
What is the major characteristic of the first elements in the periods of the periodic table? What is the general name of such elements?
Explain why All the elements of a group have similar chemical properties.
What is the fundamental difference in the electron configurations between the group 1 and group 2 elements?
What are the merits of the modern periodic table of elements?
Helium and neon are unreactive gases. What, if anything, do their atoms have in common?
What are the periods in a periodic table? Give two characteristics of each.
The atomic numbers of the three elements X, Y and Z are 2, 6 and 10 respectively.
(i) Which two elements belong to the same group?
(ii) Which two elements belong to the same period?
Give reasons for your choice.
What are horizontal rows and vertical columns in a periodic table known as?
Name two elements in Alkaline earth metals.
Name the type of elements which have outermost shell incomplete.
Write a short note.
Position of isotopes in the Mendeleev’s and the modern periodic table.
Name the cation and the anion in the salt – calcium sulphate
Give the symbol and valency of the following element and radical.
Magnesium
Give the symbol and valency of the following element and radical.
Oxygen [Oxide]
How were elements arranged in the long form of the periodic table or the Modern Periodic Table?
The groups 1 and 2 constitute the ______ block.
Find the correlation:
Group 1 and 2 : s block : : group 13 and 18 : ______
Find the correlation:
Group 13 to 18 : p block : : ______ : d block
Answer the following question in one sentence.
The modern periodic table is divided into which blocks?
p-block is composed of groups 1 and 2.
In the modern periodic table, the positions of 1 to 20 elements are shown here. Identify the elements A and B. Write their atomic number.
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?
What are groups and periods in the modern periodic table?
______ forms the basis of the modern periodic table.
The arrangement of elements in the Modem Periodic Table is based on their ______
The longest period of the Modern Periodic Table is period.
Which of the following statements about the Modern Periodic Table is correct:
Which of the following is the outermost shell for elements of period 2?
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?
“Hydrogen occupies a unique position in Modern Periodic Table”. Justify the statement.
Spot the error:
There are 5 periods and 17 groups in the modern periodic table.
Answer the following in respect of element \[\ce{_16^32S}\].
Give its electronic configuration.
Answer the following in respect of element \[\ce{_16^32S}\].
To which group and period does it belong?
Match the atomic number with the following:
A rare gas.
A group of elements in the periodic table is given below (Boron is the first member of the group and Thallium is the last).
Boron, Aluminium, Gallium, Indium, Thallium
Answer the following question in relation to the above group of elements:
If the electronic configuration of aluminium is 2, 8, 3, how many electrons are there in the outer shell of thallium?
