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प्रश्न
Define – Atom.
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उत्तर
An atom is the smallest particle of a chemical element that retains its chemical properties.
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संबंधित प्रश्न
Tick the most appropriate answer.
Who discovered that radioactive rays are given out by uranium?
- Henri Becquerel
- Marie Curie
- Pierre Curie
- Schmidt
TRUE \ FALSE
Neils Bohr gave the theory to explain the arrangement of protons in an atom.
WRITE SHORT ANSWER
What is radioactivity?
Write the names of the elements present in the:-
Ammonia
Define: Mass number
What does an atom consist of ? Explain.
Give the charge and the mass of an electron, proton and neutron present in an atom ?
Give two examples for each of ionic and covalent bond.
Fill in the blank
If an atom loses an electron, it acquires ______ a charge.
What is the usual symbol for (a) and electron (b) a proton, and (c) a neutron?
Name the unit in which the radius of an atom is usually expressed.
Compare:
Chlorine atom and chloride ion, with respect to
Atomic structure
Electrical state
Draw the diagrams representing the atomic structures of the following: Neon
Select the correct answer to the statement given below:
The basic unit of matter is not capable of independent existence.
Assertion: An atom is electrically neutral.
Reason: Atoms have equal number of protons and electrons.
Define the term ions or radicals.
In the nucleus of `""_20"Ca"^40`, there are ______
The smallest unit of an element is ______.
The first scientific theory about atoms was given by J J. Thomson.
