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प्रश्न
Complete the following table.
| Atomic number | Mass number | Number of Neutrons | Number of protons | Number of electrons | Name of the Atomic species |
| 9 | - | 10 | - | - | - |
| 16 | 32 | - | - | - | Sulphur |
| - | 24 | - | 12 | - | - |
| - | 2 | - | 1 | - | - |
| - | 1 | 0 | 1 | 0 | - |
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उत्तर
| Mass number | Mass number | Number of Neutrons | Number of protons | Number of electrons | Name of the Atomic species |
| 9 | 19 | 10 | 9 | 9 | Fluorine |
| 16 | 32 | 16 | 16 | 16 | Sulphur |
| 12 | 24 | 12 | 12 | 12 | Magnesium |
| 1 | 2 | 1 | 1 | 1 | Deuterium |
| 1 | 1 | 0 | 1 | 0 | Hydrogen ion |
Explanation:
- First Row (Fluorine):
- Mass Number: 19 = Atomic number (9) + Number of neutrons (10)
- Number of Protons: Atomic number = 9
- Number of Electrons: Atomic number = 9
- Name of the Species: Fluorine (F)
- Second Row (Sulphur):
- Number of Neutrons: 32 - Atomic number (16) = 16
- Number of Protons: Atomic number = 16
- Number of Electrons: Atomic number = 16
- Name of the Species: Sulphur (S)
- Third Row (Magnesium):
- Number of Protons: Atomic number = 12
- Number of Neutrons: 24 - Atomic number (12) = 12
- Number of Electrons: Atomic number = 12
- Name of the Species: Magnesium (Mg)
- Fourth Row (Deuterium):
- Number of Protons: Atomic number = 1
- Number of Neutrons: 2 - Atomic number (1) = 1
- Number of Electrons: Atomic number = 1
- Name of the Species: Deuterium (D)
- Fifth Row (Hydrogen Ion):
- Number of Protons: Atomic number = 1
- Number of Electrons: 0
- Name of the Species: Protium Ion or Hydrogen Ion (H⁺)
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संबंधित प्रश्न
Which of the following are isoelectronic species i.e., those having the same number of electrons?
Na+, K+, Mg2+, Ca2+, S2–, Ar
WRITE SHORT ANSWER
Define the atomic mass number of an atom.
Name the particles which actually determine the mass of an atom.
(a) What is meant by (i) atomic number, and (ii) mass number, of an element? Explain with the help of an example.
(b) What is the relation between the atomic number and mass number of an element?
(c) If an element M has mass number 24 and atomic number 12, how many neutrons does its atom contain?
The number of electrons in the atom of an element X is 15 and the number of neutrons is 16. Which of the following is the correct representation of an atom of this element ?
Match the atomic numbers 4,8,10,15 and 19 with the following:
Element with 6 valence electrons
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 |
The diagram represents an isotope of hydrogen [H]. Answer the following:
Atomic no. = 1
Mass no. = 1
If an isotope of ‘H’ has mass no. = 2, how many electrons does it have.
Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:
Carbon [At. no. = 6, Mass no. = 12]
Define the term of atomic number.
