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प्रश्न
Name two elements in Alkali metals.
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उत्तर
Sodium and potassium.
संबंधित प्रश्न
The position of three elements A, B and C in the Periodic Table are shown below –
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Group 16
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Group 17
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−
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−
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−
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A
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−
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−
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B
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C
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(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?
Name the scientist who first of all showed that atomic number of an element is a more fundamental property than its atomic mass.
Give two example of group 17 elements.
How were the positions of isotopes of an element decided in the modern periodic table?
The electronic configuration of an element T is 2, 8, 8, 1.
What is the period number of T?
An element A has 2 electrons in its fourth shell. State its electronic configuration.
Find the odd one out and give its explanation.
Write scientific reason.
There was ambiguity about the correct position of hydrogen in Mendeleev’s periodic table.
Spot the error:
There are 5 periods and 17 groups in the modern periodic table.
Give the criteria on the basis of which elements are placed (i) in a group and (ii) in a period in the modern periodic table. The atomic number of an element is 16. According to the criteria, in which group and period it should be placed?
