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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
Elements having a tendency to accept electrons are called metals
Fill in the blank
An ion with negative charge is called _______
Define: Chemical bond
Give the charge and the mass of an electron, proton and neutron present in an atom ?
Define: 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
An excess of electrons produces a ________ charge.
Fill in the blank
A deficiency of electrons produces a ________ charge.
What are the building blocks of matter ?
How is the size of an atom indicated ?
How many times is a proton heavier than an electron?
The electronic configuration of an element Z is 2, 8, 8.
(a) What is the atomic number of the element?
(b) State whether element Z is a metal or a non-metal.
(c) What type of ion (if any) will be formed by an atom of element Z? Why?
(d) What is special about the outermost electron shell of the atom of this element?
(e) Give the name and symbol of element Z.
(f) Name the group of elements to which Z belongs.
For the symbols H, D and T, write the subatomic particles (protons, neutrons and electrons) found in each one of them.
Find the mass of 2 moles of nitrogen atoms.
Calculate the number of moles in 12.044 × 1025 atoms of phosphorus.
Draw the electron dot structure of this compound.
Draw the diagrams representing the atomic structures of the following: Neon
The electronic structure [configuration] of fluorine can be written as 2, 7. In a similar way give the electronic configuration of aluminium
The basic unit of matter is ______.
Assertion: An atom is electrically neutral.
Reason: Atoms have equal number of protons and electrons.
