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प्रश्न
Why is it not possible to see an atom with naked eyes?
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उत्तर
The size of an atom is so small that it is not possible to see it with the naked eye. Also, an element's atom does not exist independently (its atomic radius is of the order of 10-10 m).
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संबंधित प्रश्न
Tick the most appropriate answer.
Who discovered that radioactive rays are given out by uranium?
- Henri Becquerel
- Marie Curie
- Pierre Curie
- Schmidt
Fill in the blank
An ion with positive charge is called ______
Define: Relative atomic mass
What does the word ‘atom’ mean?
Name the particle or particles you would expect to find in :
The orbit of an atom
Name the particle or particles you would expect to find in :
The nucleus of an atom
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the atomic numebr of X ?
Fill in the blank
A deficiency of electrons produces a ________ charge.
What is the usual symbol for (a) and electron (b) a proton, and (c) a neutron?
Name the unit in which the radius of an atom is usually expressed.
Compare:
Chlorine atom and chloride ion, with respect to
Atomic structure
Electrical state
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
Which element will lose electron?
Elements X and Y have 1 and 7 electrons in their outermost shell respectively.
What will be the charge present of the molecule XY after chemical combination?
State true or false. If false, correct the statement.
The basic unit of an element is molecule.
K: Potassium:: C: ______.
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.
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”.
