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प्रश्न
State true or false. If false, correct the statement.
The basic unit of an element is molecule.
विकल्प
True
False
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उत्तर
False
Correct statement: The basic unit of an element is atom.
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संबंधित प्रश्न
Why is it not possible to see an atom with naked eyes?
If bromine atom is available in the form of, say, two isotopes `""_35^79Br (49.7%)" and """_35^81Br (50.3%)`, calculate the average atomic mass of bromine atom.
The average atomic mass of a sample of an element X is 16.2 u. What are the percentages of isotopes `""_8^16X" and """_8^18X` in the sample?
ANSWER IN DETAIL
State the postulates of the Dalton’s atomic theory.
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:-
Glucose
Define: An 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.
Fill in the blank
A deficiency of electrons produces a ________ charge.
In what respects do the three isotopes of hydrogen differ? Give their structures.
Draw the diagrams representing the atomic structures of the following: Neon
Name the sub-atomic particles.
In the nucleus of `""_20"Ca"^40`, there are ______
Atoms of different elements having the same number of ______ are called isotones.
Give the salient features of “Modern atomic theory”.
A change in the physical state can be brought about
Lead is also known as plumbum.
The ______ are combination of atoms of various elements or the same element.
