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प्रश्न
Define:- Atom
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उत्तर
Atom: An atom is the smallest indivisible unit of an
OR
Atom is the smallest unit of matter.
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संबंधित प्रश्न
Why is it not possible to see an atom with naked eyes?
WRITE SHORT ANSWER
Name three inert gases.
Write electronic configuration of oxygen, fluorine, sodium, silicon, argon.
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 ?
How many times is a proton heavier than an electron?
Is it possible to see atoms these days ? Explain your answer.
How many atoms are there in exactly 12 g of carbon-12 element ? (C = 12 u)
In what respects do the three isotopes of hydrogen differ? Give their structures.
Draw the electron dot structure of this compound.
State the meaning of the term – (a) atom, (b) molecule, (c) radical – with a suitable example.
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.
Assertion: An atom is electrically neutral.
Reason: Atoms have equal number of protons and electrons.
1 mole of Gold and Silver contain same number of atoms.
Does the solubility of a substance change with temperature? Explain with the help of an example.
You are provided with a fine white coloured powder which is either sugar or salt. How would you identify it without tasting?
The graphite refill used is pencil is made of element called ______.
______ is a substance that is made up of three oxygen atoms chemically combined.
The ______ are combination of atoms of various elements or the same element.
Atoms have a radius of the order ______.
