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प्रश्न
Is it possible to see atoms these days ? Explain your answer.
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उत्तर
Yes, it is possible to see atoms these days, with the help of advanced technology. Electronic microscopes are extremely powerful and can magnify even the smallest particle. A Scanning Tunnelling Microscope (STM) can be used to produce highly magnified images of the surface of elements on a computer screen. Therefore, a highly sophisticated STM can be used to view atoms indirectly.
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संबंधित प्रश्न
TRUE \ FALSE
Neils Bohr gave the theory to explain the arrangement of protons in an atom.
Fill in the blank
An ion with positive charge is called ______
Define: Chemical bond
What does the word ‘atom’ mean?
State Dalton’s atomic theory.
A certain particle ‘X’ has 17 protons, 18 electrons and 20 neutrons.
What is the atomic numebr of X ?
Write the full form of IUPAC.
Why is it not possible to see an atom even with the most powerful microscope ?
An atom of element E contains 3 protons, 3 electrons and 4 neutrons :
(a) What is its atomic number?
(b) What is its mass number?
(c) Write the electronic configuration of the element E.
(d) State whether element E is a metal or non-metal. Why?
(e) What type of ion, cation or anion, will be formed by an atom of element E? Why
(f) Write the symbol of the ion formed by an atom of element E.
(g) What could element X be?
Compare:
Chlorine atom and chloride ion, with respect to
Atomic structure
Electrical state
Select the correct answer to the statement given below:
The smallest particle of a substance – capable of independent existence and which retains the characteristics of the substance.
The basic unit of matter is ______.
Define – Atom.
Name the sub-atomic particles.
Which of the following statements made by Dalton has not undergone any change?
An element is composed of ______ atoms.
The volume occupied by 4.4 g of CO2 at S.T.P ______
The number of atoms present in a molecule is called its ______.
Does the solubility of a substance change with temperature? Explain with the help of an example.
The graphite refill used is pencil is made of element called ______.
