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प्रश्न
Name the unit in which the radius of an atom is usually expressed.
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उत्तर
The radius of an atom is usually expressed in nanometre (nm).
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संबंधित प्रश्न
TRUE \ FALSE
Neils Bohr gave the theory to explain the arrangement of protons in an atom.
Write the names of the elements present in the:-
Sodium hydroxide
Write the names of `("NH"_4)_2"SO"_4` compounds:
Name two particles found inside the nucleus. What are they collectively called ?
Name three non-metals/radicals which have valency -1, -2, and -3.
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the atomic numebr of X ?
Fill in the blank
A charged particle is called an _____
Dalton's atomic theory says that atoms are indivisible. Is this statement still valid ? Give reasons for your answer.
Which of the following statement is correct about the atom of an element ?
Electron, proton, neutron are the types of ______ in an atom.
Match the pairs.
| Group 'A' | Group 'B' |
| a. Proton | i. Negatively charged |
| b. Electron | ii. Neutral |
| c. Neutron | iii. Positively charged |
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.
The basic unit of matter is ______.
The smaller particles found in the atom is called ______.
Name the sub-atomic particles.
Define the following term with an example.
Non-metal
The number of atoms present in a molecule is called its ______.
Dalton’s atomic theory successfully explained
(i) Law of conservation of mass
(ii) Law of constant composition
(iii) Law of radioactivity
(iv) Law of multiple proportions
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
What is the fundamental particle of an element?
