Grade 7 Science Quiz App Download - Atoms Molecules and Ions e-Book
Class 7 Science MCQs - Chapter 2
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In nucleus, mass of an atom is more than
A theory of movement of electrons in a fixed orbit around nucleus was given by
Two or more atoms chemically combined together form a
An electrically charged particle which is formed when an atom gains or loses electron is called
The number and types of atoms a molecule contain, are shown by its
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