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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 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.
State modern periodic law.
Give two example of group 18 elements.
How were the positions of cobalt and nickel resolved in the modern periodic table?
On which side of the periodic table will you find metals?
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?
Which element has the electronic configuration 2, 8, 2?
How would the tendency to gain electrons change on moving from left to right in a period of the periodic table?
How would the tendency to lose electrons change as we go from left to right across a period of the periodic table?
Explain why all the elements of a group have similar chemical properties.
Explain why all the elements of a period have different chemical properties.
State how the valency of elements varies in a group of the periodic table?
What is a period in a periodic table?
What are the advantages of the periodic table?
Name the type of elements which have two outermost shell incomplete.
Arrange the elements of second and third periods in increasing order of their atomic size.
Third Period.
Name an alkali metal in period 3 and halogen in period 2.
State the modern periodic law for the classification of elements. How many (i) groups and (ii) periods are there in the modern periodic table?
What is meant in the periodic table by a period?
The horizontal rows in a periodic table are called _____.
Two elements P and Q belong to the same period of the modern periodic table and are in group 1 and group 2, respectively. Compare the following characteristics in the tabular form.
- Number of electrons in their atoms
- Their tendency to lose electrons
- Their metallic characters
- Formation of their oxides
- Formulae of their chlorides
Give the symbol and valency of the following element and radical.
Sulphur [Sulphide]
Give the symbol and valency of the following element and radical.
Ammonium
Give the symbol and valency of the following element and radical.
Sulphate
Give the chemical formula of sodium hydroxide
Give the chemical formula of ammonium sulphate
The groups 1 and 2 constitute the ______ block.
Find the correlation:
Group 13 to 18 : p block : : ______ : d block
Write a scientific reason.
There was ambiguity about the correct position of hydrogen in Mendeleev’s periodic table.
Write a scientific reason.
Lithium and sodium are included in the same group in the 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.
Identify gas A in the following experiment.
If an element X is placed in group 14, what will be the formula and the nature of bonding of its chloride?
______ group elements are called alkaline earth metals.
Define periods of modern periodic table.
Name the metalloids in the first twenty elements.
Name the following metal:
A metal present in period 3, group 1 of the periodic table.
