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प्रश्न
Give reason
Actual atomic mass is greater than mass number.
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उत्तर
Actual atomic mass is greater than the mass number because the mass number is a whole number approximation of atomic mass unit. In fact, neutrons are slightly heavier than protons, and an atom has over 200 sub-atomic particles.
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संबंधित प्रश्न
Fill in the blank of the following statement :
All the mass of an atom is concentrated in a small region of space called the ___________.
From the symbol `""_15^31"P"`, state :
(i) mass number of phosphorus,
(ii) atomic number of phosphorus, and
(iii) electron configuration of phosphorus.
From the symbol `""_15^31"P"`, state : atomic number of phosphorus
Match the atomic numbers 4,8,10,15 and 19 with each of the following:
An element which does not form ion
If an atom ‘A’ has mass number 35 and atomic number 17, state the number of protons, electrons and neutrons it contains.
Explain the following terms.
- Proton
- Electron
- Neutron.
Every atom has an equal number of protons and electrons. The nature of the atom is ______.
Mass No. 27 is for the element ______.
Match the following:
| Column A | Column B | ||
| 1. | Mass of proton | a. | +1 |
| 2. | Mass of electron | b. | -1 |
| 3. | Charge of electron | c. | 9.31 x 10-28g |
| 4. | Charge of proton | d. | 1.67 x 10-24g |
Compare the charge and mass of protons and electrons.
