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प्रश्न
What are orbits or shells of an atom?
उत्तर
The circular orbits (shell present) in the space available around the nucleus on which electrons revolve are called orbits or shells of an atom.
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संबंधित प्रश्न
Multiple Choice Questions
The sub atomic particle with negative charge is
Multiple Choice Questions
The sum of number of protons and number of neutrons present in the nucleus of an atom is called its
What is variable valency? Name two elements having variable valency and state their valencies.
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Rutherford won the Nobel Prize in 1908 for his investigations in the field of ......................
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]
‘Valency is the number of hydrogen atoms which can combine with [or displace] one atom of the element [or radical] forming a compound’. With reference to the above definition of valency, state the valency of chlorine in hydrogen chloride, giving reasons.
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. = 3, how many neutrons does it have.
Draw the structure of the following atoms showing the nucleus containing – protons, neutrons and the orbits with the respective electron:
Isotopes of hydrogen [11H, 21H, 31H]
An element ‘A’ has mass number 23 and atomic number 11. State the –
- no. of neutrons in its shell,
- electronic configuration of the element ‘A’.
If an atom has 6 electrons in its outermost shell, it is inert.
