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प्रश्न
What are the groups in a periodic table? Give two characteristics of each.
उत्तर
Groups are the vertical columns of elements in the periodic table.
Characteristics of groups:
1. Elements of the same group have the same number of valence electrons.
2. Elements of the same group exhibit similar chemical properties as they have the same valency.
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संबंधित प्रश्न
On which side of the periodic table will you find metals?
What is the fundamental difference in the electron configurations between the group 1 and group 2 elements?
What is the number of elements is 1st period the modern periodic table?
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)
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
Give the chemical formula of sodium sulphite
Write scientific reason.
There was ambiguity about the correct position of hydrogen in Mendeleev’s periodic table.
Which of the following statements about the Modern Periodic Table is correct:
Three elements A, B and C have 3, 4 and 2 electrons respectively in their outermost shell. Give the group number to which they belong in the Modern Periodic Table. Also, give their valencies.
Name two elements that you would expect to show chemical reactions similar to calcium. What is the basis of your choice?
