How do u find An Atomic Number from a Chemical Formula?
For Example:-
(()2 ?
Explain.
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Class 11
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>>Structure of Atom
>>Isobars and Isotopes
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Explain with examples (i) Atomic number, (ii) Mass number, (iii) Isotopes and (iv) Isobars. Give any two uses of isotopes.
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(i) Atomic number: The atomic number is the total number of protons present in the atom. For example, the atomic number of sodium is 11. It contains 11 protons and 11 electrons.
(ii) Mass number: It is the sum of the number of neutrons and the number of protons. For example, the atomic number of magnesium is 12 which is equal to the number of protons, the number of neutrons of magnesium is 12. The mass number is equal to 24 (12+12).
(iii) Isotopes are the elements having same atomic number but different mass number. They have same chemical properties as the number of valence electrons are same. For example,
6
C
12
,
6
C
13
,
6
C
14
are the three isotopes of carbon. They have same atomic number but different mass number due to difference in the number of neutrons.
(iv) Isobars: They are elements having the same mass number but different atomic number. For example.
18
Ar
40
,
19
K
40
are isobars having the same atomic mass but different atomic number.
The two uses of isotopes are:
Nuclear weapons and nuclear power require large quantities of isotopes of uranium.
An isotope of cobalt is used in the treatment of cancer.
Answer:
Now you know that atomic number = number of protons, and mass number = number of protons + number of neutrons. To find the number of neutrons in an element, subtract the atomic number from the mass number. Here are a couple example: A single helium (He) atom has a mass number of 4 and an atomic number of 2.