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प्रश्न
Define – Atom.
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उत्तर
An atom is the smallest particle of a chemical element that retains its chemical properties.
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संबंधित प्रश्न
Write the names of the elements present in the:-
Ammonia
Write the names of the elements present in the:-
Sodium hydroxide
Define: Ions
What are orbits or shells ?
How did Neils Bohr visualise the atom ?
An atom has 13 protons and 14 neutrons.
How many electrons would be present in this atom ?
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the mass number of X?
Fill in the blank
An excess of electrons produces a ________ charge.
Fill in the blank
A deficiency of electrons produces a ________ charge.
What are the building blocks of matter ?
Dalton's atomic theory says that atoms are indivisible. Is this statement still valid ? Give reasons for your answer.
State two observations which show that atom is not indivisible.
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which element will lose electron?
State the meaning of the term – (a) atom, (b) molecule, (c) radical – with a suitable example.
The smaller particles found in the atom is called ______.
State true or false. If false, correct the statement.
An atom is electrically neutral.
Define the following term with an example.
Metal
1 mole of Gold and Silver contain same number of atoms.
You are provided with a fine white coloured powder which is either sugar or salt. How would you identify it without tasting?
Dalton’s atomic theory successfully explained
(i) Law of conservation of mass
(ii) Law of constant composition
(iii) Law of radioactivity
(iv) Law of multiple proportions
