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प्रश्न
Atomic numbers of elements A, B, C, D, E, F are 8, 7, 11, 12, 13 and 9 respectively. State the type of ions they form.
उत्तर १
The electronic configurations of the given elements are:
A = 8 (2, 6)
B = 7 (2, 5)
C = 11 (2, 8, 1)
D = 12 (2, 8, 2)
E = 13 (2, 8, 3)
F = 9 (2, 7)
Thus A, B, F will form anions and C, D, E will form cations.
उत्तर २
| Element | Atomic no. | Electronic configuration | Difference from Octet | Ion formed |
| A | 8 | 2, 6 | 8 − 6 = 2 | −2 |
| B | 7 | 2, 5 | 8 − 5 = 3 | −3 |
| C | 11 | 2, 8, 1 | One electron more than octet | +1 |
| D | 12 | 2, 8, 2 | Two electrons more than octet | +2 |
| E | 13 | 2, 8, 3 | Three electrons more than octet | +3 |
| F | 9 | 2, 7 | 8 − 7 | −1 |
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संबंधित प्रश्न
Elements in the same group show the same valency. Give scientific reason.
Rewrite the following statement after correction, if necessary:
The metallic character of elements in a period increases gradually on moving from left to right.
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?
Why does the size of the atoms progressively become smaller when we move from sodium (Na) to chlorine (Cl) in the third period of the periodic table?
Chorine in the periodic table is surrounded by the elements with atomic number 9, 16, 18 and 35.
Which of these have physical and chemical properties resembling chlorine.
Consider the section of the periodic table given below :
| Group numbers |
IA | IIA | IIIA | IVA | VA | VIA | VIIA | O |
| 1 | 2 | 13 | 14 | 15 | 16 | 17 | 18 | |
| Li | D | O | J | Ne | ||||
| A | Mg | E | Si | H | K | |||
| B | C | F | G | L |
With reference to the table, answer the following :
(i) Which is the most electro negative ?
(ii) How many valence electrons are present in G ?
(iii) Write the formula of the compound between B and H ?
(iv) In the compound between F and J, what type of bond will be formed ?
(v) Draw the electron dot structure for the compound formed between C and K.
The position of elements A, B, C, D and E in the periodic table are shown below:
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Group 1 |
Group 2 |
Group 17 |
Group 18 |
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D |
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B |
C |
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A |
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E |
State which is most reactive (i) metal (ii) non-metal
Name the elements in the correct order of their increasing atomic numbers present in the first, second, and third short periods of the periodic table.
State which of the elements are –
- metallic
- non-metallic
- noble gases
in each of the periods 2 and 3.
Name or state following with reference to the element of the first three periods of the periodic table.
The valency of elements in group 1 [I–A].
Name or state following with reference to the element of the first three periods of the periodic table.
A covalent compound formed between an element in period 1 and a halogen.
