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प्रश्न
An element A has 2 electrons in its fourth shell. State:
its valency
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उत्तर
Its valency is 2.
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संबंधित प्रश्न
Fill in the blank:
The formulae of chloride of metal M is MCl2. The metal M belongs to ……………. group.
Choose the most appropriate answer of the following:
Which of the following would weigh the least?
(A) 2-gram atoms of Nitrogen.
(B) 1mole of Silver
(C) 22.4 liters of oxygen gas at 1 atmospheric pressure and 273K
(D) 6.02 x 1023 atoms of carbon.
[Atomic masses: Ag=108, N=14, O=16, C=12]
Name the element which is in seventeenth group and second period.
How do atomic structures (electron arrangements) change in a period with increase in atomic numbers from left to right?
The atomic numbers of three elements A, B and C are given below:
| Element | Atomic number |
| A | 5 |
| B | 7 |
| C | 10 |
(i) Which element belongs to group 18?
(ii) Which element belongs to group 15?
(iii) Which element belongs to group 13?
(iv) To which period/periods do these elements belong?
Fill in the blank:
on moving from right to left in the second period, the number of valence electrons……….
Name the element in period 3 which does not form oxide.
Study the extract of the Periodic Table given below and answer the questions that follow. Give the alphabet corresponding to the element in question. DO NOT repeat an element. 
The ion of which element will migrate towards the cathode during electrolysis?
Choose the most appropriate answer from the following list of oxides which fit the description.
An amphoteric oxide.
Arrange the following in order of increasing radii:
N, O, P
