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प्रश्न
State Dalton’s atomic theory.
उत्तर
- Matter is made up of tiny particles called atoms
- Atoms are indivisible.
- Atom can be neither be created nor destroyed.
- Atoms of same element are identical in mass and properties
- Atoms of different elements differ in mass and properties
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संबंधित प्रश्न
Write the names of `"Ca"("NO"_3)_2` compounds :
Define: Relative atomic mass
Name three non-metals/radicals which have valency -1, -2, and -3.
An atom has 13 protons and 14 neutrons.
What is the atomic mass of the atom ?
Define: An Atom:
Fill in the blank
If an atom gains an electron, it is called an _______
Fill in the blank
An excess of electrons produces a ________ charge.
Fill in the blank
A deficiency of electrons produces a ________ charge.
Why is it not possible to see an atom even with the most powerful microscope ?
What value has been given to the mass of this reference atom ?
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)
In what respects do the three isotopes of hydrogen differ? Give their structures.
Draw the electron dot structure of this compound.
State true or false. If false, correct the statement.
The basic unit of an element is molecule.
Assertion: An atom is electrically neutral.
Reason: Atoms have equal number of protons and electrons.
In all atoms of an element
______ is the smallest particle of an element.
An element is composed of ______ atoms.
A change in the physical state can be brought about
