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प्रश्न
State why the atomic weight of an element is also termed relative atomic mass.
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उत्तर
- Atomic weight: Atomic weight is the mass of an atom, the number times it is heavier than an atom of hydrogen.
Since carbon atom is 12 times heavier than an atom of hydrogen. - Relative mass: Relative mass is equal to the number of times an atom of an element is heavier than 1/12 the mass of an atom of carbon.
Hence the atomic weight of an element is also termed relative atomic mass as it is in comparison with the mass of 1/12 the mass of a carbon atom.
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संबंधित प्रश्न
Explain the Atomic number with example.
WRITE SHORT ANSWER
Define the atomic mass number of an atom.
(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?
Fill in the following blanks :
| Atomic Number | Mass Number | Protons | Neutrons | Electrons | Symbol |
| 10 | 22 | _________ | _________ | _________ | _________ |
The atom of an element X has 7 electrons in its M shell.
What is the atomic number of element X?
Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.
Oxygen – \[\ce{^16_8O}\]
[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]
Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:
Silicon [At. no. = 14, Mass no. = 28]
Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:
Sodium [At. no. = 11, Mass no. = 23]
What is a neutron?
What are the letters A, Z, and X stand for?
