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प्रश्न
Assertion: An atom is electrically neutral.
Reason: Atoms have equal number of protons and electrons.
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उत्तर
Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
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संबंधित प्रश्न
TRUE \ FALSE
Cathode rays are a stream of fast moving particles that travel in random directions.
Define:- Atom
State Dalton’s atomic theory.
Name the particle or particles you would expect to find in :
The orbit of an atom
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is such a particle called ?
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the charge on the particle ?
Name the unit in which the radius of an atom is usually expressed.
Write the relation between nanometre and metre.
How many times is a proton heavier than an electron?
Is it possible to see atoms these days ? Explain your answer.
Give scientific reason.
All the mass of an atom is concentrated in the nucleus.
Draw diagrams representing the atomic structures of the following:
- Sodium atom
- Chlorine ion
- Carbon atom
- Oxygen ion
The electronic structure [configuration] of fluorine can be written as 2, 7. In a similar way give the electronic configuration of aluminium
Atoms of different elements having ______ mass numbers, but ______ atomic numbers are called isobars.
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
The graphite refill used is pencil is made of element called ______.
The smallest unit of an element is ______.
