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Question
What is meant by the term subatomic particles?
Solution 1
“Particles into which an atom is divided are called subatomic particles.” Protons, electrons, neutrons.
Solution 2
Subatomic particles: A subatomic particle is a structural and functional unit of matter. That means all the matters are made up of these fundamental particles. According to modern atomic theory, an atom has a nucleus, which is present in its centre or core. These nucleus contain subatomic particles like protons and neutrons.
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Multiple Choice Questions
number of valence electrons present in magnesium is
What are the two main parts of which an atom is made of?
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The electrons revolving in shells close to the nucleus are called ................... electrons.
Draw the electronic configuration of the following elements clearly stating the number of neutrons and protons in their nucleus.
a. Beryllium b. Silicon
c. Chlorine d. Aluminium
e. Nitrogen
ANSWER IN DETAIL
Write a note on valence shell.
Fill in the blank of the following statement :
The electron has _________ charge, the proton has _________ charge, and the neutron has _________ charge.
State the location of electrons, protons and neutrons in an atom.
Define the term Valence shell.
With reference to the discovery of the structure of an atom, explain in brief – William Crookes experiment for the discovery of cathode rays, followed by – J.J. Thomsons experiment pertaining to the constituents of the cathode rays. State which sub-atomic particle was discovered from his experiment.
