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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.
Define:- Atom
Define:- Molecule
Write the names of the elements present in the:-
Ammonia
Write the names of the elements present in the:-
Acetic acid
Fill in the blank:
Atoms are _____
Fill in the blank
An ion with negative charge is called _______
Define: Ions
Define: Relative atomic mass
Name two particles found inside the nucleus. What are they collectively called ?
What is the maximum number of electrons present in:
1. first shell
2. second shell
3. third shell and
4. fourth shell
Who originated the word ‘atom’ ?
Name the particle or particles you would expect to find in :
The nucleus of an atom
Fill in the blank
If an atom gains an electron, it is called an _______
What value has been given to the mass of this reference atom ?
Select the correct answer to the statement given below:
The smallest particle of a substance – capable of independent existence and which retains the characteristics of the substance.
K: Potassium:: C: ______.
______ is the smallest particle of an element.
Atoms have a radius of the order ______.
A small block slides down on a smooth inclined plane, starting from rest at time t = 0. Let Sn be the distance travelled by the block in the interval t = n – 1 to t = n. Then, the ratio `S_n/(S_(n + 1))` is ______.
