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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
In Milikan’s experiment, static electric charge on the oil drops has been obtained by shining X-rays. If the static electric charge on the oil drop is - 1.282 × 10-18C, calculate the number of electrons present on it.
Multiple Choice Questions
If the atomic number of an atom is 17 and mass number is 35 then number of neutron will be
Fill in the following blanks :
| Atomic Number | Mass Number | Protons | Neutrons | Electrons | Symbol |
| 10 | 22 | _________ | _________ | _________ | _________ |
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From the symbol `""_12^24"Mg"`
, state the mass number, the atomic number and electronic configuration of magnesium.
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:
Lithium [At. no. = 3, Mass no. = 7]
Differentiate mass number from atomic number.
Mass No =______ + No. of Neutrons.
If an atom has 6 electrons in its outermost shell, it is inert.
