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प्रश्न
What is meant by the 'atomic number of an element'?
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उत्तर
An atomic number of an element is the number of protons in the nucleus of an atom.
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संबंधित प्रश्न
The composition of the nuclei of two atomic species X and Y are given as under
| X | Y | |
| Protons | 6 | 6 |
| Neutrons | 6 | 8 |
Give the mass numbers of X and Y. What is the relation between the two species?
Fill in the blanks.
Isotopes are the atoms of ______ element having the ______ atomic number but ______ mass number.
Multiple Choice Questions
The sum of number of protons and number of neutrons present in the nucleus of an atom is called its
What is the significance of atomic numbers in the modern Periodic Table?
The atom of an element is made up of 4 protons, 5 neutrons and 4 electrons. What are its atomic number and mass number?
If an atom ‘A’ has atomic number 19 and mass number 39, state –
- Its electronic configuration.
- The number of valence electrons it possesses.
Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:
Isotopes of hydrogen [11H, 21H, 31H]
Differentiate between the following term:
Atomic number and mass number
K and L shells can accommodate a maximum of 2 and 8 electrons respectively.
Compare the charge and mass of protons and electrons.
