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प्रश्न
Fill in the blank of the following statement :
The total number of protons and neutrons in the nucleus of an atom is called its _________.
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उत्तर
The total number of protons and neutrons in the nucleus of an atom is called its mass number.
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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
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?
State the main postulates of Dalton’s atomic theory.
Differentiate between the following term:
Atomic number and mass number
What is atomic number?
What is a neutron?
‘A’ is denoted by ______.
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 |
In which one of the following, the number of protons is greater than the number of neutrons but number of protons is less than the number of electrons?
An element has 2 electrons in its N shell.
What is its atomic number?
