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प्रश्न
Define the following term:
Atom
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उत्तर
An atom is the smallest particle of an element which retains its chemical identity in all physical and chemical changes.
संबंधित प्रश्न
Tick the most appropriate answer.
Who discovered that radioactive rays are given out by uranium?
- Henri Becquerel
- Marie Curie
- Pierre Curie
- Schmidt
WRITE SHORT ANSWER
What is radioactivity?
An atom has 13 protons and 14 neutrons.
What is the atomic number of the atom ?
Define: An Atom:
Fill in the blank
If an atom loses an electron, it acquires ______ a charge.
Fill in the blank
An _______ is electrically neutral.
Fill in the blank
An excess of electrons produces a ________ charge.
Is it possible to see atoms these days ? Explain your answer.
One nm is equal to :
Which of the following statement is correct about the atom of an element ?
How many atoms are there in exactly 12 g of carbon-12 element ? (C = 12 u)
Which has more atoms, 50 g of aluminium or 50 g of iron ? Illustrate your answer with the help of calculations.
(Atomic masses : Al = 27 u ; Fe = 25 u)
Deduce from the datum provided.
| Datum | To deduce |
| \[\ce{_11^23Na}\] | Neutron number |
| \[\ce{_6^14C}\] | Mass number |
| \[\ce{_17^37 Cl}\] | Proton number |
In what respects do the three isotopes of hydrogen differ? Give their structures.
Draw the basic structure of an atom representing its –
- Subatomic particles
- Nucleus
- Orbits or shells.
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.
Define the following term with an example.
Metal
1 mole of Gold and Silver contain same number of atoms.
Atomic models have been improved over the years. Arrange the following atomic models in the order of their chronological order
- Rutherford’s atomic model
- Thomson’s atomic model
- Bohr’s atomic model
The ______ are combination of atoms of various elements or the same element.
