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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
FILL IN THE BLANK
Atomic theory of matter was given by ..........................
TRUE \ FALSE
After the emission of a beta-particle, the atomic number of the atom increases by one.
(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 | _________ | _________ | _________ | _________ |
State the main postulates of Dalton’s atomic theory.
State why the atomic weight of an element is also termed relative atomic mass.
Draw the atomic diagram of the following element showing the distribution of – protons, neutrons and the electrons in the various shell of the atom.
Carbon – \[\ce{^12_6C}\]
[The upper number represent the – mass number and the lower number represent the – atomic number e.g. calcium – mass number = 40, atomic number = 20]
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.
Differentiate between the following term:
Atomic number and mass number
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?
