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प्रश्न
(a) Which of the nuclear particles is present in the same fixed number in the atoms of any particular element?
(b) What do we call this number which is characteristic of a particular element?
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उत्तर
(a) The number of protons present in the atom of any particular element i.e., the atomic number is fixed.
(b) This number which is the characteristic of a particular element is called its atomic number.
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संबंधित प्रश्न
Complete the following table.
| Atomic number | Mass number | Number of Neutrons | Number of protons | Number of electrons | Name of the Atomic species |
| 9 | - | 10 | - | - | - |
| 16 | 32 | - | - | - | Sulphur |
| - | 24 | - | 12 | - | - |
| - | 2 | - | 1 | - | - |
| - | 1 | 0 | 1 | 0 | - |
Give the following a suitable word/phrase.
Atoms of same element with same atomic number but a different mass number.
What are the two main features of Rutherford’s atomic model?
An element has an atomic number 12. How many electrons will be present in the K, L and M energy shells of its atom?
What is the significance of atomic numbers in the modern Periodic Table?
Match the atomic numbers 4,8,10,15 and 19 with the following:
Element with four shells
Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:
Carbon [At. no. = 6, Mass no. = 12]
From the symbol \[\ce{^4_2He}\] for the element helium, write down the mass number and the atomic number of the element.
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.
If element M has mass number 24 and atomic number 12, how many neutrons does its atom contain?
