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प्रश्न
Explain the rule according to which electrons are filled in various energy levels.
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उत्तर
- The maximum capacity of a shell to accommodate electrons is given by the general formula 2n2, where n is the serial number of a shell.
- The maximum number of electrons possible in the outermost shell is 8 and that in the penultimate shell is 18.
- It is not necessary for an orbit to be completed before another is formed. In fact, a new orbit is formed when the outermost shell attains 8 electrons.
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संबंधित प्रश्न
State whether the following statement is true or false :
The cathode rays obtained from all the gases consist of negatively charged particles called electrons.
The atom of an element X has 7 electrons in its M shell.
What type of ion will be formed by an atom of element X? Write the symbol of the ion formed.
What could element X be?
Which sub-atomic particle was discovered by Chadwick.
Name the sub-atomic particle whose charge is -1.
Give the symbol and charge of each particle.
Choose the correct option:
The mass number of an atom whose unipositive ion has 10 electrons and 12 neutrons is :
_______ is a negatively charged particle.
All non–metals will have ______ electrons in the outermost orbit of their atoms.
Helium has two electrons in the outermost orbit and so it is chemically inert.
When an atom gains an electron it has more electrons and thus it carries a positive charge.
