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प्रश्न
Who originated the word ‘atom’ ?
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उत्तर
Democritus
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संबंधित प्रश्न
Why is it not possible to see an atom with naked eyes?
Write the names of the elements present in the:-
Glucose
Name the particles which revolve around the nucleus.
Name three non-metals/radicals which have valency -1, -2, and -3.
Define: An Atom:
Fill in the following blanks with suitable words :
In water, the proportion of oxygen and hydrogen is .............. by mass.
Is it possible to see atoms these days ? Explain your answer.
State two observations which show that atom is not indivisible.
An atom of an element X may be written as `""_9^4"X"`
(a) What does the figure 9 indicate?
(b) What does the figure 4 indicate?
(c) What is the number of protons in atom X?
(d) What is the number of neutrons in atom X?
(e) What is the number of electrons in atom X?
(f) How many electrons are there in the outermost shell of an atom of element X?
(g) Write the symbol of ion formed by an atom of element X.
State the meaning of the term – (a) atom, (b) molecule, (c) radical – with a suitable example.
Select the correct answer to the statement given below:
Imaginary path around the nucleus of an atom in which electrons revolve.
The electronic structure [configuration] of fluorine can be written as 2, 7. In a similar way give the electronic configuration of aluminium
Name the sub-atomic particles.
Define the following term with an example.
Compound
Define the following term with an example.
Metalloid
The volume occupied by 1 mole of a diatomic gas at S.T.P is ______
The number of atoms present in a molecule is called its ______.
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?
A sample of vitamic C is known to contain 2.58 ×1024 oxygen atoms. How many moles of oxygen atoms are present in the sample?
