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प्रश्न
An element belongs to the third period and Group IIIA (13) of the periodic table. State: the number of valence electrons,
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उत्तर
The number of valence electrons is 3
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संबंधित प्रश्न
Based on the group valency of elements state the formula lot the following giving justification for each :-
(i) Oxides of 1st group elements,
(ii) Halides of the elements of group 13, and
(iii) Compounds formed when an element of group 2 combines with, an element of group 16.
Which element has a total of two shells, with three electrons in its valence shell?
Five elements A, B, C, D and E have atomic numbers of 2, 3, 7, 10 and 18 respectively. The elements which belong to the same period of the periodic table are:
(a) A, B, C
(b) B, C, D
(c) A, D, E
(d) B, D, E
Name two properties of elements whose magnitudes change when going from top to bottom in a group of the periodic table. In what manner do they change?
An element has 2 electrons in its N shell.
State the name assigned to this group.
What is the common feature of the electronic configuration of the elements at the end of period 2, and period 3?
'In a group, the atomic radii increase with increasing period number', explain this statement and justify it with reference to group 17.
Choose the most appropriate answer from the following list of oxides which fit the description.
A basic oxide.
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 |
State which is metals, non-metals, and noble gas in this table.
Moving left to right in the second period, the number of valence electrons _____.
