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प्रश्न
What is the number of elements in the 1st period?
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उत्तर
There are two elements in the first period.
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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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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?
How many periods and groups are there in the long form of periodic table?
Consider the following elements:
Na, Ca, Al, K, Mg, Li
Which of these elements belong to the same group of the periodic table?
State how the valency of elements varies in a period of the periodic table?
From the standpoint of atomic structure, what determines which element will be the first and which the last in a period the periodic table?
Name the type of elements which have outermost shell complete.
The electronic configuration of an element T is 2, 8, 8, 1.
What is the group number of T?
Group 1 and 2 : s block : : group 13 and 18 : _______
Find the odd one out and give its explanation.
A group of elements in the periodic table is given below (Boron is the first member of the group and Thallium is the last).
Boron, Aluminium, Gallium, Indium, Thallium
Answer the following question in relation to the above group of elements:
If the electronic configuration of aluminium is 2, 8, 3, how many electrons are there in the outer shell of thallium?
