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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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संबंधित प्रश्न
What are the atomic numbers of elements whose outermost electrons is represented by 3s1.
Multiple Choice Questions
If the atomic number of an atom is 17 and mass number is 35 then number of neutron will be
TRUE \ FALSE
After the emission of a beta-particle, the atomic number of the atom increases by one.
Fill in the blank of the following statement :
All the mass of an atom is concentrated in a small region of space called the ___________.
What is the significance of atomic numbers in the modern Periodic Table?
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?
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]
Differentiate mass number from atomic number.
Complete the following table.
| Atomic Number | Mass Number | Number of Neutrons | Number of Protons | Number of Electrons | Name of the Element |
| 9 | ______ | 10 | ______ | ______ | ______ |
| 16 | ______ | 16 | ______ | ______ | ______ |
| ______ | 24 | ______ | ______ | 12 | Magnesium |
| ______ | 2 | ______ | 1 | ______ | ______ |
| ______ | 1 | 0 | 1 | 1 | ______ |
A ______ number describes a specific aspect of an electron.
