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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
Elements A, B and C have atomic number 17, 19 and 10 respectively.
State which one is a non-metal.
Match the atomic number 4, 8, 14, 15 and 19 with each of the following:
(a) A solid non-metal of valelncy 3.
(b) A gas of valency 2.
(c) A metal of valency 1.
(d) A non-metal of valency 4
Give electron dot diagram of the following:
nitrogen
State differences between the properties of ionic compounds and covalent compounds.
In term of electron transfer, define Oxidation
A Compound 'X' consists of only molecules. Hence 'X' will have
Element X is a metal with a valency 2; Y is a non-metal with a valency 3.
(a) Write an equation to show how Y forms as ion
(b) If Y is a diatomic gas, write an equation for the direct combination of X and Y to form a compound.
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 questions based on the table above:
What is the formula of the compound formed between X and Z.
An element with the atomic number 19 will most likely combine chemically with the element whose atomic number is
Give the orbital diagram of the following:
Magnesium chloride
