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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
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.
Why do all the elements of the same group have similar properties?
Name the scientist who first of all showed that atomic number of an element is a more fundamental property than its atomic mass.
Fill in the following blank with suitable word:
The basis for modern periodic table is ...............
Fill in the following blank with suitable word:
Group 17 elements are known as ...............
How many periods and groups are there in the long form of periodic table?
Give two example of group 17 elements.
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 group of the periodic table?
Which element has two shells, both of which are completely filled with electrons?
What is the usual number of valence electrons in the atoms of the last element in a period?
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 the scientist who stated the modern periodic law.
Correct the statement.
Copper and zinc are representative elements.
Name two elements in each case: Lanthanides
What do you understand by typical elements?
Answer the following in respect of element `31/15 P `
To which group and period does it belong?
Arrange the elements of second and third periods in increasing order of their atomic size.
Third Period.
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?
Write a short note.
Structure of the modern periodic table.
How many periods and groups are there in the modern periodic table?
How does number of (i) valence electrons (ii) valency; vary on moving from left to right in the second period of a periodic table?
In the Modern Periodic Table – atoms of all elements are arranged according to their increasing order of – atomic numbers. An atom of nitrogen has seven protons and seven electrons. State what would be its atomic number.
Give the symbol and valency of the following element and radical.
Sulphur [Sulphide]
Give the symbol and valency of the following element and radical.
Sulphite
Give the chemical formula of sodium bicarbonate
Give the chemical formula of ammonium sulphate
Compare Modern Periodic Law with Mendeleev's Periodic Law.
Group 1 and 2 : s block : : group 13 and 18 : _______
The K and L shells of the elements Na and Mg contain electrons.
Write scientific reason.
There was ambiguity about the correct position of hydrogen in Mendeleev’s periodic table.
Noble gases belong to______ group of the periodic table.
On moving from left to right in a period in the periodic table, the size of the atom ______
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?
What is the symbol of the element Tungsten?
The elements A, B, C, D and E have atomic number 9, 11, 17, 12 and 13 respectively. Which pair of elements belong to the same group?
An element which is an essential constituent of all organic compounds belongs to
The three elements A, B and C with similar properties have atomic masses X, Y and Z respectively. The mass of Y is approximately equal to the average mass of X and Z. What is such an arrangement of elements called as? Give one example of such a set of elements.
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 variable valency and is a member of the Oxygen family (group 16).
Spot the error:
The elements of group 13 are called the carbon family.
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 |
Which of the element is a Metalloid?
What is the general name of the last elements of the Periodic Table?
Answer the following in respect of element \[\ce{_16^32S}\].
Give its electronic configuration.
