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प्रश्न
Who originated the word ‘atom’ ?
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उत्तर
Democritus
APPEARS IN
संबंधित प्रश्न
TRUE \ FALSE
Elements combine in definite proportions to form compounds.
TRUE \ FALSE
Elements having a tendency to accept electrons are called metals
ANSWER IN DETAIL
Enlist the features of Bohr’s model of an atom. How did he correct the Rutherford’s model ?
Write the names of the elements present in the :-
Sulphuric acid
Write the names of the elements present in the:-
Sodium hydroxide
Write the names of the elements present in the:-
Acetic acid
Name the particles which revolve around the nucleus.
What are orbits or shells ?
What does the word ‘atom’ mean?
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
Does the particle have an excess of electrons or a deficiency of electrons ?
What is the usual symbol for (a) and electron (b) a proton, and (c) a neutron?
Draw the electron dot structure of this compound.
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which element will gain electron?
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which will form negative ion?
The basic unit of matter is ______.
Name the sub-atomic particles.
Define the following term with an example.
Metalloid
Which of the following statements made by Dalton has not undergone any change?
Give the salient features of “Modern atomic theory”.
A change in the physical state can be brought about
