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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?
Fill in the following blank with suitable word:
Group 1 elements are called ...............
How many periods and groups are there in the long form of periodic table?
Give two example of group 1 elements.
How were the positions of isotopes of an element decided in the modern periodic table?
where should hydrogen be placed in the modern periodic table? Give reason for your answer.
Would you place the two isotopes of chlorine, CI-35 and CI-37 in different slots because of their different atomic masses or in the same slot because their chemical properties are the same? Justify your answer.
Name the scientist who prepared modern periodic table.
Which of the following statement about the modern periodic table is correct?
(a) It has 18 horizontal rows known as periods.
(b) It has 7 vertical columns known as periods.
(c) It has 18 vertical columns known as groups.
(d) It has 7 horizontal rows known as groups.
The modern periodic table was prepared by ______.
What are the merits of the modern periodic table of elements?
What are the periods in a periodic table? Give two characteristics of each.
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)
Define:
Periodic table
How many groups and periods does the modern periodic table have?
What do you understand by typical elements?
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.
What is meant in the periodic table by a period?
From the standpoint of atomic structure, what determines which elements will be the first and which the last in a period of the periodic table?
Name an element of group 18 which can form compounds.
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.
Oxygen [Oxide]
Give the chemical formula of sodium nitrate
Give the chemical formula of calcium phosphate
How were elements arranged in the long form of the periodic table or the Modern Periodic Table?
Find the correlation:
Mendeleev’s periodic table : atomic mass : : Modern periodic table : _______
Right or wrong sentence.
The modern periodic table shows the molecular masses of the elements in each frame.
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.
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.
On moving from left to right in a period in the periodic table, the size of the atom ______
A part of modern periodic table is given below. On its basis, answer the following questions:
| Group No. → | 1 | 2 | 13 | 14 | 15 | 16 | 17 | 18 |
| Period ↓ | ||||||||
| 2 | A | B | ||||||
| 3 | E | D | F | C |
Write the molecular formula of the compound formed by the combination:
A and F
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 ______.
An element has 2 electrons in its N shell.
Is it a metal or a non-metal?
Answer the following in respect of element \[\ce{_16^32S}\].
Give its electronic configuration.
Give reason for the following:
Inert gases do not form ion.
