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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.
What are the two main features of Rutherford’s atomic model?
Fill in the blanks- The number of protons in the nucleus of an atom is called its ....................
An atom of an element has two electrons in the M shell.
What is the (a) atomic number (b) number of protons in this element?
Name or state the following:
Elements having same mass number but different atomic number
The diagram represents an isotope of hydrogen [H]. Answer the following:
Atomic no. = 1
Mass no. = 1
Are isotopes atoms of the same element or different elements.
What is atomic number?
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 ratio of the radii of hydrogen atom and its nucleus is ~ 105. Assuming the atom and the nucleus to be spherical,
- what will be the ratio of their sizes?
- If atom is represented by planet earth ‘Re ’ = 6.4 ×106 m, estimate the size of the nucleus.
______ = No. of protons = No. of the electrons.
