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प्रश्न
\[\ce{^24_12Mg}\] and \[\ce{^26_12Mg}\] are symbols of isotopes of magnesium.
(a) Compare the atoms of these isotopes with respect to :
i. the composition of their nuclei
ii. their electronic configurations
(b) Give reasons why the two isotopes of magnesium have different mass numbers.
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उत्तर
(a) i.
|
|
\[\ce{^24_12Mg}\] |
\[\ce{^26_12Mg}\] |
|
|
|
|
|
No. of electrons |
12 |
12 |
|
No. of protons |
12 |
12 |
|
No. of neutrons |
24 - 12 = 12 |
26 - 12 = 14 |
Hence, the composition of nuclei
\[\ce{_12Mg^24->(P,n),(12+12)_12Mg^26->(p,n)(12+14)}\]
ii. Electronic configuration = 2, 8, 2
(b) Mass numbers of two isotopes of magnesium are different because of the different number of neutrons, i.e. 12 and 14, respectively.
संबंधित प्रश्न
Complete the following:
| Sodium | Phosphorus | Carbon | |
| Formula of chloride | |||
| Nature of bonding | |||
| Physical state of chloride |
The following table shows the electronic configuration of the elements W, X, Y, Z:
|
Element |
W |
X |
Y |
Z |
|
Electronic |
2, 8, 1 |
2, 8, 7 |
2, 5 |
1 |
Answer the following question based on the table above:
What is the formula of the compound formed between W and X.
How many atoms of each kind are present in the following molecule:
Calcium oxide
Elements X, Y, and Z have atomic numbers 6, 9 and 12 respectively. Which one forms a cation?
Name an element which does not contain neutron.
Name the following:
The shell closest to the nucleus of an atom
Draw the geometric atomic structure of the three isotopes of hydrogen and the two isotopes of chlorine.
Match the following:
| 1. | Monoatomic gaseous atom | a. | Electrovalent bond |
| 2. | Octet rule | b. | Benzene |
| 3. | Ionic bond | c. | Water |
| 4. | Non-polar solvent | d. | Electronic theory of valence |
| 5. | Polar solvent | e. | Noble gases |
Choose the odd one out and write the reason:
What is meant by a chemical bond?
