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प्रश्न
State the modern periodic law for classification of elements. How many (i) groups and (ii) periods are there in the modern periodic table?
उत्तर
Modern periodic law:
“Properties of elements are a periodic function of their atomic number”.
(i) There are 18 groups (group 1 − group 18) and
(ii) 7 periods in the modern periodic table.
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संबंधित प्रश्न
Give two example of group 17 elements.
Name the scientist who prepared modern 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.
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)
Name the type of elements which have one electron short of octet.
Name the noble gas with 3 shells.
Give the symbol and valency of the following element and radical.
Nitrate
Fill in the blank:
The element lithium in the Modern Periodic Table with valency 1+ belongs to the group ______.
State the number of elements in Period 1 of the Periodic Table.
Define periods of modern periodic table.
