10 Questions
What is the smallest unit of an element?
Atom
What is the central part of an atom called?
Nucleus
What is the total number of protons and neutrons in an atom called?
Mass number
Which scientist is credited with discovering the electron?
J.J. Thomson
Which subatomic particle has a negative charge?
Electron
What is the outermost shell of an atom called?
Valence shell
What is the term for atoms of the same element with different numbers of neutrons?
Isotope
What is the term for an atom or molecule with a net electric charge due to the loss or gain of one or more electrons?
Ion
How many orbital shells are there in an atom according to the Bohr model?
4
What is the term for the process where an atom gains or loses electrons to form charged particles (ions)?
Ionization
Study Notes
Atomic structure
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Test your knowledge of atomic structure concepts with this quiz designed for Class 9 students. Questions cover topics such as atomic models, subatomic particles, and the periodic table.
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