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प्रश्न
What are orbits or shells of an atom?
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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
What are the atomic numbers of elements whose outermost electrons is represented by 3s1.
Dalton said that ______ could not be divided.
Tick the most appropriate answer.
Which of these have similar chemical properties but different set of physical properties and mass number?
- isobars
- elements
- isotopes
- none of these
The mass number of an element is 18. It contains 7 electrons. What is the number of protons and neutrons in it? What is the atomic number of the element?
An element A atomic number 7 mass numbers 14
B electronic configuration 2,8,8
C electrons 13, neutrons 14
D Protons 18 neutrons 22
E Electronic configuration 2,8,8,1
State Valency of each element
An element A atomic number 7 mass numbers 14
B electronic configuration 2,8,8
C electrons 13, neutrons 14
D Protons 18 neutrons 22
E Electronic configuration 2,8,8,1
State (i) Valency of each element (ii) which one is a metal (iii) which is non-metal (iv) which is an inert gas
Match the atomic numbers 4,8,10,15 and 19 with the following:
Element with 6 valence electrons
State the main postulates of Dalton’s atomic theory.
Define the term ‘atomic number’ of an atom.
The diagram represents an isotope of hydrogen [H]. Answer the following:
Atomic no. = 1
Mass no. = 1
Which sub-atomic particles in the 3 isotopes of ‘H’ are the same.
What is the relation between mass number & atomic number?
