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Complete the following table.
|
Atomic Number |
Mass Number |
Number of Neutrons |
Number of Protons |
Number of Electrons |
Name of the Atomic Species |
|
9 |
- |
10 |
- |
- |
- |
|
16 |
32 |
- |
- |
- |
Sulphur |
|
- |
24 |
- |
12 |
- |
- |
|
- |
2 |
- |
1 |
- |
- |
|
- |
1 |
0 |
1 |
0 |
- |
Answer
Following are the formulae used while computing the table:
- Atomic number = Number of protons = Number of electrons
- Mass number = Number of protons + Number of neutrons
- Number of neutrons = Mass number - Number of protons/electrons
= Mass number - Atomic number
-
First row:
i) Atomic number = 9 ,
Therefore, the number of protons = number of electrons = 9
ii) Mass number = Number of protons + Number of neutrons = 9 + 10 = 19.
(iii) The atomic species having atomic number 9 is Fluorine.
-
Second row:
i) Atomic number = 16 ,
Therefore, the number of protons = number of electrons = 16
ii) Mass number - Number of protons = Number of neutrons
= 32 - 16 = 16
-
Third row:
i) Number of protons = 12
Therefore, Number of protons = Number of electrons = Atomic number = 12
so the atomic number is 12 and the number of electrons is also 12.
ii) Mass number - Number of protons = Number of neutrons
= 24 - 12 = 12.
iii) The atomic species of atomic number 12 is Magnesium.
-
Fourth row:
i) Number of protons = 1 ,
So, Number of protons = Number of electrons = Atomic number = 1
ii) Mass number - Number of protons = Number of neutrons
= 2 -1 = 1.
iii) The atomic species of atomic number 1 and mass number 2 is heavy Hydrogen or Deuterium.
-
Fifth row:
i) Number of protons = 1 ,
So, Number of protons = Atomic number = 1
ii) The atomic species of atomic number 1 and mass number 1 is ordinary Hydrogen.
But since Number of electrons = 0, it is Hydrogen ion H+.
Now, we can complete the table using the above calculations: -
|
Atomic Number (Z=p and e) |
Mass Number (A = p+n) |
Number of Neutrons (n) |
Number of Protons (p) |
Number of Electrons (e) |
Name of the Atomic Species |
|
9 |
9+10 = 19 |
10 |
9 |
9 |
Fluorine |
|
16 |
32 |
32-16= 16 |
16 |
16 |
Sulphur |
|
12 |
24 |
24-12= 12 |
12 |
12 |
Magnesium |
|
1 |
2 |
2-1= 1 |
1 |
1 |
Deuterium |
|
1 |
1 |
0 |
1 |
0 |
Hydrogen ion |
