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प्रश्न
Give scientific reason.
All the mass of an atom is concentrated in the nucleus.
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उत्तर
All the mass of an atom is concentrated in the nucleus because the atom contains three subatomic particles like electron, proton and neutron. Out of which, the nucleus present at the centre of an atom contains two subatomic particles that are protons and neutrons, and the mass of the nucleus is the sum of the mass of protons and neutrons located at the centre of an atom.
संबंधित प्रश्न
TRUE \ FALSE
Elements combine in definite proportions to form compounds.
Write the names of the elements present in the following compound.
Common salt
Write the names of the elements present in the:-
Sodium hydroxide
Name two particles found inside the nucleus. What are they collectively called ?
Name three non-metals/radicals which have valency -1, -2, and -3.
Define: Covalent bond
An atom has 13 protons and 14 neutrons.
What is the atomic number of the atom ?
Define: An Atom:
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the charge on the particle ?
Fill in the blank
An _______ is electrically neutral.
Fill in the blank
A deficiency of electrons produces a ________ charge.
Write the full form of IUPAC.
Electron, proton, neutron are the types of ______ in an atom.
Draw diagrams representing the atomic structures of the following:
- Sodium atom
- Chlorine ion
- Carbon atom
- Oxygen ion
Define the following term with an example.
Metalloid
Define the term ions or radicals.
1 mole of Gold and Silver contain same number of atoms.
Atomic models have been improved over the years. Arrange the following atomic models in the order of their chronological order
- Rutherford’s atomic model
- Thomson’s atomic model
- Bohr’s atomic model
The smallest unit of an element is ______.
