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प्रश्न
Based on the group valency of element write the molecular formula of the following compound giving justification:
Halide of the elements of group thirteen
उत्तर
Halides of group 13 elements have a common formula of MX3, where M-metal and X- halogen element.
Example- AICI3, BF3. This is because the valency of group 13 elements is 3 and that of halogens is 1 so, to satisfy the combining capacity of aluminum or other group 13th elements three of halogens are required in the molecular formula.
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संबंधित प्रश्न
How do the atomic size and metallic character of elements vary as we move :-
(a) down a group and
(b) from left to right in a period
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How does the tendency to gain electrons change as we go down in group 17 of the periodic table? Why does it change this way?
The atomic numbers of the elements Na, Mg, K and Ca are 11, 12, 19 and 20 respectively. The element having the largest atomic radius is:
(a) Mg
(b) Na
(c) K
(d) Ca
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Give examples in support of your answer.
atomic structure (electron arrangements) ?
State whether the following statement is true or false
On moving horizontally across a period, number of valence electrons increases from one to eight.
The elements of one short period of the periodic table are given below in order from left to right:
| Li | Be | B | C | O | F | Ne |
One element of this period is missing. Which is the missing element and where should it be placed?
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 most reactive (i) metal (ii) non-metal
An element belongs to the third period and Group IIIA (13) of the periodic table. State: the number of valence electrons,
An element A has 2 electrons in its fourth shell. State:
is it an oxidising or reducing agent
