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प्रश्न
Differentiate mass number from atomic number.
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उत्तर
| Sr. No. | Atomic number | Mass number |
| 1. | The number of electrons or protons in an atom is called atomic number of that atom. | The number of protons and neutrons present is its nucleus is called mass number of that atom. |
| 2. | It is represented by the letter Z | It is represented by the letter ‘A’. |
| 3. | Example: Helium (He) has 2 protons and two electrons hence its atomic number will be 2. | Example: Sodium (Na) has 11 protons and 12 Neutrons hence its mass number A= 11 + 12 = 23 |
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संबंधित प्रश्न
What are the atomic numbers of elements whose outermost electrons is represented by 2p3.
The atom of an element is made up of 4 protons, 5 neutrons and 4 electrons. What is its atomic number and mass number?
(a) Which of the nuclear particles is present in the same fixed number in the atoms of any particular element?
(b) What do we call this number which is characteristic of a particular element?
Fill in the following blanks :
| Atomic Number | Mass Number | Protons | Neutrons | Electrons | Symbol |
| 10 | 22 | _________ | _________ | _________ | _________ |
From the symbol `""_15^31"P"`, state : atomic number of phosphorus
From the symbol `""_2^4"He"` for the element helium, write down the mass number and the atomic number of the element.
Define the term of atomic number.
What are nucleons? How many nucleons are present in Phosphorous? Draw its structure.
Give short answer:
what is the atomic mass number? mention its formula.
In a neutral atom number of protons is equal to the number of neutrons.
