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प्रश्न
An element 'M' with electronic configuration (2, 8, 2) combines separately with (NO3)–, (SO4)2– and (PO4)3– radicals. Write the formula of the three compounds so formed. To which group and period of the Modern Periodic Table does the element 'M' belong? Will 'M' form covalent or ionic compounds? Give reason to justify your answer.
उत्तर
Electronic configuration of M = 2, 8, 2
Number of valence electrons of M = 2
Valency of M = Number of valence electrons = 2
Valency of the nitrate ion `(NO_3^-)` = 1
Valency of the sulphate ion `(SO_4^-2)` = 2
Valency of the phosphate ion `(PO_4^-3)` = 3
The formulae of nitrate, sulphate and phosphate formed by M are M(NO3)2, MSO4 and M3(PO4)2, respectively.
Since the valency of M is 2 and the atomic number of M is 12 (i.e. 2 + 8 + 2), this element belongs to the group 2 and period 3 of the periodic table.
This element will tend to form ionic compounds by losing two valence electrons to achieve a noble gas electronic configuration, that is, a stable octet in the valence shell.
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संबंधित प्रश्न
Study the following table in which positions of six elements A, B, C, D, E and F are shown as they are in the modern periodic table:
|
Group→
Period↓ |
1
|
2
|
3-12
|
13
|
14
|
15
|
16
|
17
|
18
|
| 2 | A | B | C | ||||||
| 3 | D | E | F |
On the basis of the above table, answer the following questions:-
(i) Name the element which forms only covalent compounds.
(ii) Name the element which is a metal with valency three.
(iii) Name the element which is a non-metal with valency three.
(iv) Out of D and E, which is bigger in size and why?
(v) Write the common name for the family to which the elements C and F belong.
The elements 4Be, 12Mg and 20Ca, each having two valence electrons in their valence shells, are in periods 2, 3 and 4 respectively of the modern periodic table. Answer the following questions associated with these elements, giving reason in each case:
(a) In which group should they be?
(b) Which one of them is least reactive?
(c) Which one of them has the largest atomic size?
Which element has a total of two shells, with three electrons in its valence shell?
name the elements in period 1.
Select the correct answer
Identify the metalloid
Choose the most appropriate answer from the following list of oxides which fit the description.
An amphoteric oxide.
Choose the most appropriate answer from the following list of oxides which fit the description.
An amphoteric oxide: Al2O3 (shows both acidic and basic properties)
Arrange the following in order of increasing radii:
Mg2+, Mg, Mg+
State the property trends in general of elements on moving from left to right in a period of the periodic table.
There are three elements E, F, G with atomic numbers 19, 8 and 17 respectively.
Classify the above elements as metals and non-metals.
