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प्रश्न
Give a reason for the following:
Helium is chemical extremely unreactive.
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उत्तर
Helium has its outermost shell completely filled i.e. 2 electrons in K shell.
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संबंधित प्रश्न
What is the maximum number of electrons which can be accommodated in the :
(a) innermost shell of an atom?
(b) outermost shell of an atom?
Which shell of an atom can accommodate a maximum of :
(a) 8 electrons ?
(b) 32 electrons ?
Which of the following represents the correct electron distribution in magnesium ion?
Give scientific reason.
Atoms are stable though negatively charged electron is revolving within it.
Mention the basic tendency of an atom which makes it combine with other atoms
An atom X has 2, 8, 7 electrons in its shell. It combines with Y having 1 electron in its outermost shell.
Write the formula of the compound formed.
The atom of aluminium is represented by 27Al13. Write down the number of the arrangement of electrons in the different orbits or shells in one atom of aluminium.
What are ‘energy levels’?
Explain the octet rule for the formation of –
Sodium chloride from a sodium atom and a chlorine atom.
Name an element which has the same number of electrons in its first and second shell.
