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प्रश्न
An element has an atomic number 12. How many electrons will be present in the K, L and M energy shells of its atom?
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उत्तर
Electronic configuration of element with atomic number 12 is:
K2 L8 M2
There will be 2 electrons in the K shell, 8 electrons in the L shell and 2 electrons in the M shell of its atom.
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संबंधित प्रश्न
Write true or false for the following statement
An atom on the whole has a positive charge.
Name the particles which actually determine the mass of an atom.
Fill in the following blanks in respect of an atom of an element
| No. of protons | No. of neutron | Mass number | Atomic number | No. of electrons | Symbol |
| 11 | 12 | ___________ | ___________ | ___________ | ________ |
Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.
Calcium – \[\ce{^40_20Ca}\]
[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]
Atomic number : ______ :: Mass number : Number of protons and neutrons.
The atomic number of an element is 9, it has 10 neutrons. Find the element from the periodic table. What will be its mass number?
Every atom has an equal number of protons and electrons. The nature of the atom is ______.
A ______ number describes a specific aspect of an electron.
Match the following:
| Column A | Column B | ||
| 1. | Mass of proton | a. | +1 |
| 2. | Mass of electron | b. | -1 |
| 3. | Charge of electron | c. | 9.31 x 10-28g |
| 4. | Charge of proton | d. | 1.67 x 10-24g |
If M is the atomic mass and A is the mass number, then packing fraction is given by ______.
