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प्रश्न
Match the atomic number with the following:
An element of group 2.
पर्याय
19
15
8
4
2
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उत्तर
4
संबंधित प्रश्न
The position of three elements A, B and C in the Periodic Table are shown below –
|
Group 16
|
Group 17
|
|
−
|
−
|
|
−
|
A
|
|
−
|
−
|
|
B
|
C
|
(a) State whether A is a metal or non-metal.
(b) State whether C is more reactive or less reactive than A.
(c) Will C be larger or smaller in size than B?
(d) Which type of ion, cation or anion, will be formed by element A?
What is the significance of atomic number in the modern classification of elements? Explain with the help of an example.
What is the main characteristic of the last elements in the periods of the periodic table? What is the general name of such elements?
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)
What are horizontal rows and vertical columns in a periodic table known as?
State the modern periodic law for classification of elements. How many (i) groups and (ii) periods are there in the modern periodic table?
Give the symbol and valency of the following element and radical.
Chlorine [Chloride]
Give the symbol and valency of the following element and radical.
Oxygen [Oxide]
Group 1 and 2 : s block : : group 13 and 18 : _______
Which one of the following elements exhibit maximum number of valence electrons?
