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प्रश्न
Define the term ‘mass number’ of an atom.
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उत्तर
Mass number of an element is equal to the sum of protons and neutrons in the nucleus of the atom.
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संबंधित प्रश्न
The mass number of an element is 18. It contains 7 electrons. What is the number of protons and neutrons in it? What is the atomic number of the element?
From the symbol `""_15^31"P"`, state : atomic number of phosphorus
The properties of the elements are a periodic function of their __________.
Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.
Carbon – \[\ce{^12_6C}\]
[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]
Elements X, Y, Z have atomic numbers 6, 9 and 12 respectively. Which one:
- forms anion – negative ion;
- forms cation – positive ion;
- has 4 electrons in the outermost orbit. [Y, Z, X]
Explain the following terms.
- Proton
- Electron
- Neutron.
A ______ number describes a specific aspect of an electron.
When an atom gives electrons from its outermost shell, it becomes ______ charged.
‘A’ is denoted by ______.
In a neutral atom number of protons is equal to the number of neutrons.
