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प्रश्न
What are nucleons? How many nucleons are present in Phosphorous? Draw its structure.
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उत्तर
Nucleons: Particles which constitute the nucleus are called nucleons.
Protons and neutrons are nucleons.
The atomic mass of phosphorus = 31
Atomic number = 15
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Multiple Choice Questions
The sub atomic particle with negative charge is
The atom of an element is made up of 4 protons, 5 neutrons and 4 electrons. What is its atomic number and mass number?
What is meant by the 'atomic number of an element'?
What are orbits or shells of an atom?
If an atom ‘A’ has atomic number 19 and mass number 39, state –
- Its electronic configuration.
- The number of valence electrons it possesses.
An element ‘A’ has mass number 23 and atomic number 11. State the –
- no. of neutrons in its shell,
- electronic configuration of the element ‘A’.
Differentiate between the following term:
Atomic number and mass number
Show diagrammatically the electron distributions in a sodium atom and a sodium ion and also give their atomic number.
Mass No. 27 is for the element ______.
If an atom has 6 electrons in its outermost shell, it is inert.
