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Question
Name or state following with reference to the element of the first three periods of the periodic table.
A metal in period 3 having valency 3.
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Solution
Metal in period 3 is A1 [Aluminium]
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RELATED QUESTIONS
How many groups and periods are there in the modern periodic table?
What is meant by 'group' in the modern periodic table? How do the following change on moving from top to bottom in a group?
(i) Number of valence electrons
(ii) Number of occupied shells
(iii) Size of atoms
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(v) Effective nuclear charge experienced by valence electrons
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An element which is an essential constituent of all organic compounds belongs to following group of modern periodic table:
(a) group 4
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- Fill in the blanks:
The atomic size ______ as we move from left to right across the period, because the ______ increases, but the ______ remains the same.
The position of elements A, B, C, D and E in the periodic table are shown below:
|
Group 1 |
Group 2 |
Group 17 |
Group 18 |
|
|
|
|
D |
|
|
B |
C |
|
|
A |
|
|
E |
Which is larger in size (i) D or E (ii) B or C
An element belongs to the third period and Group IIIA (13) of the periodic table. State: the number of valence electrons,
The electronic configuration of an element is 2, 8, 4. State it:
name and write its one physical property.
State the following:
The group to which the element with an electronic configuration of 2, 8, 2 belongs.
