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प्रश्न
Name and state the following with reference to the elements of the first three periods of the periodic table.
Non-metallic elements present in Period 3 of Groups 15 and 16.
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उत्तर
Non-metallic elements present in Period 3 of Groups 15 and 16 - Phosphorus and sulphur
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संबंधित प्रश्न
The atomic numbers of three elements A, B and C are 12, 18 and 20 respectively. State, giving reason, which two elements will show similar properties.
How do the atomic size and metallic character of elements vary as we move?
- down a group and
- from left to right in a period
The following table shows the electronic configuration of the elements W, X, Y, Z:
| Element | w | x | y | z |
| Electronic configurations |
2, 8, 1 | 2, 8, 7 | 2, 5 | 1 |
Answer the following questions based on the table above:
1) What type of Bond is formed between :
a) W and X
b) Y and Z
2) What is the formula of the compound formed between :
a) X and Z
b) W and X
Rewrite the following statement after correction, if necessary:
The metallic character of elements in a period increases gradually on moving from left to right.
The element which has the maximum number of valence electrons is:
(a) Na
(b) P
(c) Si
(d) A
Calculate the valency of element X whose atomic number is 9.
On the basis of electronic configuration, how will you identify the first and the last element of a period?
Fill in the blank
There are ______ groups and ______ periods in the modern form of periodic table.
State whether the following statement is true or false
Similar electronic configuration is repeated after intervals of 2, 8, 8, 18 and 32.
An element belongs to the third period and Group IIIA (13) of the periodic table. State: the name of the element.
