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प्रश्न
An element is composed of ______ atoms.
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उत्तर
An element is composed of same kind of atoms.
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संबंधित प्रश्न
TRUE \ FALSE
Elements combine in definite proportions to form compounds.
WRITE SHORT ANSWER
Name three inert gases.
ANSWER IN DETAIL
How are isobars different from isotopes ?
Write the names of the elements present in the:-
Ammonia
Write the names of `"Ca"("NO"_3)_2` compounds :
Who originated the word ‘atom’ ?
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is such a particle called ?
Fill in the blank
An excess of electrons produces a ________ charge.
State two observations which show that atom is not indivisible.
What is an atom ? How do atoms usually exist ?
Calculate the number of moles in 12.044 × 1025 atoms of phosphorus.
Which has more atoms, 50 g of aluminium or 50 g of iron ? Illustrate your answer with the help of calculations.
(Atomic masses : Al = 27 u ; Fe = 25 u)
Select the correct answer to the statement given below:
The basic unit of matter is not capable of independent existence.
Define the following term with an example.
Element
An atom of an element has no electron. Will that atom have any mass or not? Can an atom exist without electron? If so then give example.
Atoms of one element can be transmuted into atoms of other elements by ______
Give the salient features of “Modern atomic theory”.
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
______ is a substance that is made up of three oxygen atoms chemically combined.
What are the 3 most abundant atoms on the earth?
