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प्रश्न
State any five features of modern periodic table.
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उत्तर
- All the elements are arranged in the increasing order of their atomic number
- The horizontal rows are called periods. There are seven periods in the periodic table.
- The elements are placed in periods based on the number of shells in their atoms
- Vertical columns in the periodic table starting from top to bottom are called groups. There are 18 groups in the periodic table
- Based on the physical and chemical properties of elements, they are grouped into various families.
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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?
How does the tendency of elements to gain electrons change as we move from left to right in a period? State the reason of this change.
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.
What is the number of valence electrons in the atoms of first elements in a period?
Helium and neon are unreactive gases. What, if anything, do their atoms have in common?
An element barium has the atomic number 56. Look up its position in the periodic table and answer the following question.
Is it larger or smaller than caesium (Cs)?
Give the symbol and valency of the following element and radical.
Bisulphate
p-block is composed of groups 1 and 2.
Which of the following elements does not lose an electron easily?
Explain the position of hydrogen in the periodic table.
