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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
State the mass number, the atomic number, number of neutrons and electronic configuration of the following atoms.
`""^12""_6C, ""^16""_8O, ""^19""_9F, ""^20""_10Ne, ""_13""Al""^27, ""_17""Cl""^35`
Also, draw atomic diagrams for them.
What is meant by the 'atomic number of an element'?
Define the term of atomic number.
What is common salt? Name the elements present in it. Write the formula of common salt. What are the atomic number and the mass number of the elements? Write the ions in the compound.
Which of the following are true for an element?
- Atomic number = number of protons + number of electrons
- Mass number = number of protons + number of neutrons
- Atomic mass = number of protons = number of neutrons
- Atomic number = number of protons = number of electrons
The particles that make up the atom are called ______ particles.
Explain the following terms.
- Proton
- Electron
- Neutron.
The elementary particles such as protons and neutrons are collectively called ______.
______ = No. of protons = No. of the electrons.
In which one of the following, the number of protons is greater than the number of neutrons but number of protons is less than the number of electrons?
