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प्रश्न
Define the term ‘mass number’ of an atom.
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
What are the atomic numbers of elements whose outermost electrons is represented by 2p3.
The atom of an element is made up of 4 protons, 5 neutrons and 4 electrons. What is its atomic number and mass number?
The atomic number of four elements A, B, C and D are 12, 13, 15 and 3 respectively. The element which cannot form a cation is :
Match the atomic numbers 4,8,10,15 and 19 with the following:
Element which can form trivalent ion
Match the statements in List I with the correct answer from List II.
| List I | List II |
| 1. Mass number of an atom is the number of protons and | A: Electron |
| 2. The sub-atomic particle with a negligible mass. | B: Argon |
| 3. An atom having stable electronic configuration. | C: Nitrogen |
| 4. A molecule formed by sharing of electrons [covalency] | D: Sodium |
| 5. A metallic atom having unstable electronic configuration. | E: Neutrons |
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Atomic no. = 1
Mass no. = 1
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______ = No. of protons = No. of the electrons.
‘Z’ is denoted by ______.
Compare the charge and mass of protons and electrons.
