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प्रश्न
Give the salient features of “Modern atomic theory”.
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उत्तर
(i) An atom is no longer indivisible.
(ii) Atoms of the same element may have different atomic mass.
Eg: isotopes 17Cl35, 17Cl37.
(ii) Atoms of different elements may have the same atomic masses.
Eg: Isobars 18Ar40, 20Ca40.
(iv) Atoms of one element can be transmuted into atoms of other elements. An atom is no longer indestructible.
(v) Atoms may not always combine in a simple whole-number ratio.
Eg: Glucose C6H12O6 C : H : O = 6 : 12 : 6 or 1 : 2 : 1.
(vi) Atom is the smallest particle that takes part in a chemical reaction.
(vii) The mass of an atom can be converted into energy (E = mc²).
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संबंधित प्रश्न
Write the names of the elements present in the following compound.
Common salt
Write the names of `"FeS"` compounds :
Name the particle or particles you would expect to find in :
The nucleus of an atom
Write the full form of IUPAC.
What is the usual symbol for (a) and electron (b) a proton, and (c) a neutron?
The electronic configuration of an element Z is 2, 8, 8.
(a) What is the atomic number of the element?
(b) State whether element Z is a metal or a non-metal.
(c) What type of ion (if any) will be formed by an atom of element Z? Why?
(d) What is special about the outermost electron shell of the atom of this element?
(e) Give the name and symbol of element Z.
(f) Name the group of elements to which Z belongs.
Deduce from the datum provided.
| Datum | To deduce |
| \[\ce{_11^23Na}\] | Neutron number |
| \[\ce{_6^14C}\] | Mass number |
| \[\ce{_17^37 Cl}\] | Proton number |
Select the correct answer to the statement given below:
Imaginary path around the nucleus of an atom in which electrons revolve.
Draw the structure of an atom and explain the position of the sub-atomic particles.
In all atoms of an element
