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प्रश्न
What is atomic number?
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उत्तर
The number of electrons or protons in an atom is called the atomic number of that atom. It is represented by the letter Z.
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संबंधित प्रश्न
What are the atomic numbers of elements whose outermost electrons is represented by 3p5?
Write true or false for the following statement
An atom on the whole has a positive charge.
FILL IN THE BLANK
Atomic theory of matter was given by ..........................
From the symbol `""_15^31"P"`, state :
(i) mass number of phosphorus,
(ii) atomic number of phosphorus, and
(iii) electron configuration of phosphorus.
Elements X, Y and Z have atomic numbers 6,9 and 12 respectively. Which one:
- Forms an anion
- Forms a cation
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.
The No. of electrons in the outermost shell of the atom of an inert gas ______.
Ca2+ has completely filled outer shell. Justify your answer.
An element has 2 electrons in its N shell.
What is its atomic number?
