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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
Why is it not possible to see an atom with naked eyes?
WRITE SHORT ANSWER
Define an ionic compound.
Define:- Atom
Write the names of the elements present in the following compound.
Common salt
Write the names of the elements present in the:-
Sodium hydroxide
Write the names of `("NH"_4)_2"SO"_4` compounds:
Define: Ions
Define: Relative atomic mass
What does the word ‘atom’ mean?
Name the particle or particles you would expect to find in :
The nucleus of an 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?
Dalton's atomic theory says that atoms are indivisible. Is this statement still valid ? Give reasons for your answer.
Is it possible to see atoms these days ? Explain your answer.
One nm is equal to :
How many atoms are there in exactly 12 g of carbon-12 element ? (C = 12 u)
Give scientific reason.
All the mass of an atom is concentrated in the nucleus.
Name the gas that.
Turns moist starch iodide paper blue black.
A radical take part – unsplit in a chemical reaction and retains its identity in reactions.
With reference to the radical –
- ammonium
- bisulphate
- carbonate
state the group of atoms present in each radical.
Select the correct answer to the statement given below:
The basic unit of matter is not capable of independent existence.
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.
The basic unit of matter is ______.
An atom of an element has no electron. Will that atom have any mass or not? Can an atom exist without electron? If so then give example.
The volume occupied by 4.4 g of CO2 at S.T.P ______
A change in the physical state can be brought about
The most abundant type of atom is the universe is ______.
Lead is also known as plumbum.
The first scientific theory about atoms was given by J J. Thomson.
