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प्रश्न
Why is it not possible to see an atom with naked eyes?
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उत्तर
The size of an atom is so small that it is not possible to see it with the naked eye. Also, an element's atom does not exist independently (its atomic radius is of the order of 10-10 m).
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संबंधित प्रश्न
Write the names of the elements present in the :-
Sulphuric acid
Fill in the blank:
Atoms are _____
Who originated the word ‘atom’ ?
Fill in the blank
An _______ is electrically neutral.
Fill in the blank
An excess of electrons produces a ________ charge.
Why is it not possible to see an atom even with the most powerful microscope ?
Dalton's atomic theory says that atoms are indivisible. Is this statement still valid ? Give reasons for your answer.
One nm is equal to :
An atom of element E contains 3 protons, 3 electrons and 4 neutrons :
(a) What is its atomic number?
(b) What is its mass number?
(c) Write the electronic configuration of the element E.
(d) State whether element E is a metal or non-metal. Why?
(e) What type of ion, cation or anion, will be formed by an atom of element E? Why
(f) Write the symbol of the ion formed by an atom of element E.
(g) What could element X be?
The electronic configuration of an element Z is 2, 8, 8.
(a) What is the atomic number of the element?
(b) State whether element Z is a metal or a non-metal.
(c) What type of ion (if any) will be formed by an atom of element Z? Why?
(d) What is special about the outermost electron shell of the atom of this element?
(e) Give the name and symbol of element Z.
(f) Name the group of elements to which Z belongs.
Give scientific reason.
All the mass of an atom is concentrated in the nucleus.
Deduce from the datum provided.
| Datum | To deduce |
| \[\ce{_11^23Na}\] | Neutron number |
| \[\ce{_6^14C}\] | Mass number |
| \[\ce{_17^37 Cl}\] | Proton number |
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which element will lose electron?
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which element will gain electron?
Draw the basic structure of an atom representing its –
- Subatomic particles
- Nucleus
- Orbits or shells.
Define the following term with an example.
Metal
An element is composed of ______ atoms.
The volume occupied by 4.4 g of CO2 at S.T.P ______
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?
Write any two observations which support the fact that atoms are divisible.
