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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 two main features of Rutherford’s atomic model?
What is meant by the 'atomic number of an element'?
Match the atomic numbers 4,8,10,15 and 19 with the following:
Element with 6 valence electrons
Define the term ‘mass number’ 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.
Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.
Phosphorus – \[\ce{^31_15P}\]
[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]
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 | ______ |
What is mass number of an atom?
Every atom has an equal number of protons and electrons. The nature of the atom is ______.
A group of elements in the periodic table is given below (Boron is the first member of the group and Thallium is the last).
Boron, Aluminium, Gallium, Indium, Thallium
Answer the following question in relation to the above group of elements:
The atomic number of boron is 5. Write the chemical formula of the compound formed when boron reacts with chlorine.
