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प्रश्न
Write any one difference in the electronic configurations of group-1 and group-2 elements ?
उत्तर
The valence electrons in the 1st group is 1 and that of the 2nd group is 2.
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संबंधित प्रश्न
The elements Be, Mg and Ca each having two electrons in their outermost shells are in periods 2, 3, and 4 respectively of the modern periodic table. Answer the following questions, giving justification in each case:-
(i) Write the group to which these elements belong.
(ii) Name the least reactive element.
(iii) Name the element having largest atomic radius.
An element 'X' has mass number 35 and number of neutrons 18. Write atomic number and electronic configuration of 'X'. Also write group number, period number and valency of 'X'.
Write the number of horizontal rows in the modern periodic table. What are these rows called?
Calculate the mass of Calcium that will contain the same number of the atom as are present in 3.2 gm of Sulphur.
[Atomic masses: S=32, Ca=40]
In which part of a group would you separately expect the elements to have the largest atomic size?
Which of the following element does not lose an electron easily?
(a) Na
(b) F
(c) Mg
(d) Al
Complete the following sentences
The similarities in the properties of a group of elements are because they have the same …………………
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)
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 |
|
|
|
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D |
|
|
B |
C |
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|
A |
|
|
E |
Which type of ion will be formed by elements A, B, and C.
Match the option A and B with the statements (i) and (ii):
| A. metal | (i) The metal that forms two types of ion. |
| B. iron | (ii) An element with electronic configuration 2, 8, 8, 3. |
