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प्रश्न
What is an atom ? How do atoms usually exist ?
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उत्तर
Atoms are building blocks of all matter. They are the smallest particles of elements that can take part in a chemical reaction.
Atoms usually exist in combined form, in two ways:
- in the form of molecules
- in the form of ions
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संबंधित प्रश्न
TRUE \ FALSE
Neils Bohr gave the theory to explain the arrangement of protons in an atom.
Name two particles found inside the nucleus. What are they collectively called ?
State Dalton’s atomic theory.
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 ?
Fill in the blank
A charged particle is called an _____
Fill in the blank
A deficiency of electrons produces a ________ charge.
State two observations which show that atom is not indivisible.
Which of the following statement is correct about the atom of an element ?
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)
Compare:
Chlorine atom and chloride ion, with respect to
Atomic structure
Electrical state
The electronic structure [configuration] of fluorine can be written as 2, 7. In a similar way give the electronic configuration of aluminium
The electronic structure [configuration] of fluorine can be written as 2, 7. In a similar way give the electronic configuration of phosphorus
The smaller particles found in the atom is called ______.
Project.
To have an idea of what atoms are, students can be asked to construct atoms using pipe cleaners (thin metal wires-electron shells), pompoms (balls-different colours for protons and neutrons) and beads (electrons). Students will love and enjoy putting them together and they look great hanging from the ceiling in the classroom.
Which of the following has maximum number of atoms?
Write any two observations which support the fact that atoms are divisible.
Atoms have a radius of the order ______.
