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प्रश्न
Differentiate mass number from atomic number.
What is the difference between atomic number and mass number?
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उत्तर
| Sr. No. | Atomic number | Mass number |
| 1. | The number of electrons or protons in an atom is called the atomic number of that atom. | The number of protons and neutrons present in its nucleus is called the mass number of that atom. |
| 2. | It is represented by the letter Z. | It is represented by the letter ‘A’. |
| 3. | Example: Helium (He) has 2 protons and two electrons; hence, its atomic number will be 2. | Example: Sodium (Na) has 11 protons and 12 neutrons; hence, its mass number A = 11 + 12 = 23 |
संबंधित प्रश्न
If number of electrons in an atom is 8 and number of protons is also 8, then
- What is the atomic number of the atom? and
- What is the charge on the atom?
Explain the Mass number with example.
From the symbol `""_15^31"P"`, state : atomic number of phosphorus
From the symbol `""_2^4"He"` for the element helium, write down the mass number and the atomic number of the element.
Give reason
Actual atomic mass is greater than mass number.
The atomic number of an element is 9, it has 10 neutrons. Find the element from the periodic table. What will be its mass number?
Complete the following table.
| Atomic Number | Mass Number | Number of Neutrons | Number of Protons | Number of Electrons | Name of the Element |
| 9 | ______ | 10 | ______ | ______ | ______ |
| 16 | ______ | 16 | ______ | ______ | ______ |
| ______ | 24 | ______ | ______ | 12 | Magnesium |
| ______ | 2 | ______ | 1 | ______ | ______ |
| ______ | 1 | 0 | 1 | 1 | ______ |
Mass No. 27 is for the element ______.
Electrons revolve around the nucleus in definite open shells.
What are the letters A, Z, and X stand for?
