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प्रश्न
Name and state the following with reference to the elements of the first three periods of the periodic table.
Alkaline earth metal in period 3.
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उत्तर
Magnesium
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संबंधित 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.
Rewrite the following statement after correction, if necessary:
The metallic character of elements in a period increases gradually on moving from left to right.
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?
Why sodium element of group 1 and chlorine element of group 17 both have valency 1?
Why are noble gases placed in a separate group?
Name the element of lower nuclear charge out of Be and Mg.
F, Cl and Br are the elements each having seven valence electrons. Which of these (i) has the largest atomic radius, (ii) is most reactive? Justify your answer stating reason for each.
Arrange the following as per instruction given in the bracket.
Cl, F, Br, I (increasing electron affinity)
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 |
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|
B |
C |
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|
A |
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|
E |
Which type of ion will be formed by elements A, B, and C.
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 |
|
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A |
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E |
Which is larger in size (i) D or E (ii) B or C
