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प्रश्न
An element has 2 electrons in its N shell.
What is its atomic number?
उत्तर
Electronic configuration of the element is:
| K | L | M | N |
| 2 | 8 | 8 | 2 |
Atomic number of element is (2 + 8 + 8 + 2) = 20
संबंधित प्रश्न
If number of electrons in an atom is 8 and number of protons is also 8, then
- What is the atomic number of the atom? and
- What is the charge on the atom?
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 two main features of Rutherford’s atomic model?
Fill in the blank of the following statement :
The total number of protons and neutrons in the nucleus of an atom is called its _________.
From the symbol `""_15^31"P"`, state :
(i) mass number of phosphorus,
(ii) atomic number of phosphorus, and
(iii) electron configuration of phosphorus.
Match the atomic numbers 4,8,10,15 and 19 with the following:
Element which can form trivalent ion
Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:
Sodium [At. no. = 11, Mass no. = 23]
Name the 3 sub-atomic particles of an atom.
‘Z’ is denoted by ______.
What are the letters A, Z, and X stand for?
