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प्रश्न
______ is the smallest particle of an element.
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उत्तर
Atom is the smallest particle of an element.
APPEARS IN
संबंधित प्रश्न
TRUE \ FALSE
Elements having a tendency to accept electrons are called metals
ANSWER IN DETAIL
State the postulates of the Dalton’s atomic theory.
Name three non-metals/radicals which have valency -1, -2, and -3.
Write electronic configuration of oxygen, fluorine, sodium, silicon, argon.
An atom has 13 protons and 14 neutrons.
What is the atomic number of the atom ?
Why is it not possible to see an atom even with the most powerful microscope ?
Calculate the number of moles in 12.044 × 1025 atoms of phosphorus.
Match the pairs.
| Group 'A' | Group 'B' |
| a. Proton | i. Negatively charged |
| b. Electron | ii. Neutral |
| c. Neutron | iii. Positively charged |
Draw diagrams representing the atomic structures of the following:
- Sodium atom
- Chlorine ion
- Carbon atom
- Oxygen ion
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.
K: Potassium:: C: ______.
Assertion: An atom is electrically neutral.
Reason: Atoms have equal number of protons and electrons.
Define the following term with an example.
Metalloid
The volume occupied by 4.4 g of CO2 at S.T.P ______
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
______ is a substance that is made up of three oxygen atoms chemically combined.
The first scientific theory about atoms was given by J J. Thomson.
Atoms have a radius of the order ______.
