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प्रश्न
‘Valency is the number of hydrogen atoms which can combine with [or displace] one atom of the element [or radical] forming a compound’. With reference to the above definition of valency, state the valency of chlorine in hydrogen chloride, giving reasons.
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उत्तर
Hydrogen chloride [HCl], one atom of chlorine has combined with one atom of hydrogen, and also 1 atom of hydrogen can be replaced by metals like potassium, sodium. Hence valency of chlorine in one.
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संबंधित 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 | - |
What are the atomic numbers of elements whose outermost electrons is represented by 3p5?
Multiple Choice Questions
If the atomic number of an atom is 17 and mass number is 35 then number of neutron will be
WRITE SHORT ANSWER
Define the atomic mass number of an atom.
Fill in the blanks- The number of protons in the nucleus of an atom is called its ....................
Fill in the blank of the following statement :
All the mass of an atom is concentrated in a small region of space called the ___________.
The atomic number and mass number of sodium are 11 and 23 respectively. What information is conveyed by this statement?
Sulphur has an atomic number 16 and a mass of 32.
State the number of protons and neutrons in the nucleus of sulphur. Give a simple diagram to show the arrangement of electrons in an atom of sulphur.
Show diagrammatically the electron distributions in a sodium atom and a sodium ion and also give their atomic number.
Match the following:
| Column A | Column B | ||
| 1. | K shell | a. | 8 |
| 2. | L shell | b. | 32 |
| 3. | M shell | c. | 2 |
| 4. | N shell | d. | 18 |
