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प्रश्न
State the modern periodic law.
Answer the following sub-question regarding the modern periodic table:
Write modern periodic law.
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उत्तर
Modern periodic law states that “The physical and chemical properties of all elements are a periodic function of their atomic numbers”.
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संबंधित प्रश्न
In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21, and 38. Which of these have physical and chemical properties resembling calcium?
Write the names given to the vertical columns and horizontal rows in the Modern Periodic Table. How does the metallic character of elements vary on moving down a vertical column? How does the size of atomic radius vary on moving left to right in a horizontal row? Give reason in support of your answer in the above two cases.
Name the scientist who first of all showed that atomic number of an element is a more fundamental property than its atomic mass.
How were the positions of cobalt and nickel resolved in the 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 atomic particle whose number in the atoms of an element always remains the same and which forms the real basis for the modern classification of elements is:
(a) electron
(b) proton
(c) neutron
(d) meson
Consider the following elements:
Na, Ca, Al, K, Mg, Li
Which of these elements belong to the same 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.
On the basis of electronic configuration, how will you identify the first element of a period?
What happens to the number of valence electrons in the atoms of elements as we go down in a group of the periodic table?
In what respects do the properties of group 1 elements differ from those of group 17 elements? Explain with examples by taking one element from each group.
What are the groups in a periodic table? Give two characteristics of each.
The elements A, B, C and D belong to groups 1, 2, 14 and 17 respectively of the periodic table. Which of the following pairs of elements would produce a covalent bond?
(i) A and D
(ii) C and D
(iii) A and B
(iv) B and C
(v) A and C
Name two elements in Inert gas.
Name the metals in the first twenty elements.
Write the number of protons, neutrons and electronic configuration of \[\ce{_19^39K, _15^31P}\]. Also state their position in periodic table.
Answer the following in respect of element `31/15 P`
Give its electronic configuration
State the main aim of classifying elements. Which is the more fundamental property of elements that is used in the development of Modern Periodic Table? Name and state the law based on this fundamental property. On which side of the periodic table one can find metals, non-metals and metalloids?
How will the tendency to gain electrons change as we go from left to right across a period? Why?
How does number of (i) valence electrons (ii) valency; vary on moving from left to right in the second period of a periodic table?
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
Name the cation and the anion in the salt – calcium sulphate
Give the symbol and valency of the following element and radical.
Hydrogen
Give the symbol and valency of the following element and radical.
Zinc
Give the symbol and valency of the following element and radical.
Chlorine [Chloride]
Give the symbol and valency of the following element and radical.
Hydroxide
Give the symbol and valency of the following element and radical.
Sulphate
Give the chemical formula of ammonium sulphate
Find the correlation:
Group 13 to 18 : p block : : ______ : d block
Right or wrong sentence.
To the left of the zig-zag line in the periodic table are the metal elements.
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 any five features of modern periodic table.
Identify gas A in the following experiment.
The element which has the least tendency to lose electrons is ______
Where would you locate the element with electronic configuration 2,8 in the Modern Periodic Table?
Which of the following elements would lose an electron easily?
If an element X is placed in group 14, what will be the formula and the nature of bonding of its chloride?
Compare the radii of two species X and Y. Give reasons for your answer.
- X has 12 protons and 12 electrons
- Y has 12 protons and 10 electrons
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 a similar structure to diamond.
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.
Noble gases are placed in the ______ group in the modern periodic table.
Explain the position of hydrogen in the periodic table.
Define groups of modern periodic table.
An element with atomic number ______ will form a basic oxide.
1H2 is an isotope of hydrogen. In the modern Periodic Table it will ______.
