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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.
APPEARS IN
संबंधित प्रश्न
TRUE \ FALSE
Elements having a tendency to accept electrons are called metals
TRUE \ FALSE
Cathode rays are a stream of fast moving particles that travel in random directions.
ANSWER IN DETAIL
State the postulates of the Dalton’s atomic theory.
Fill in the blank:
Atoms are _____
Define: Relative atomic mass
Name the particle or particles you would expect to find in :
The nucleus of an atom
An atom has 13 protons and 14 neutrons.
What is the atomic number of the atom ?
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the charge on the particle ?
Fill in the blank
An _______ is electrically neutral.
Fill in the blank
An excess of electrons produces a ________ charge.
Name the unit in which the radius of an atom is usually expressed.
Give brief information of three subatomic particles with reference to electrical charge, mass and location.
Define the following term:
Atom
Match the pairs.
| Group 'A' | Group 'B' |
| a. Proton | i. Negatively charged |
| b. Electron | ii. Neutral |
| c. Neutron | iii. Positively charged |
Name the gas that.
Turns moist starch iodide paper blue black.
The basic unit of matter is ______.
In all atoms of an element
Does the solubility of a substance change with temperature? Explain with the help of an example.
What are the 3 most abundant atoms on the earth?
Atoms have a radius of the order ______.
