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The statement that "Matter is made of atoms that have positive centers of neutrons and protons surrounded by a cloud of negatively charged electrons" is A a theory.
The atomic structure is based on the atomic model created by Rutherford and Bohr.
Rutherford's atomic model states that atoms consist of positively charged particles located in the nucleus and negatively charged electrons around the nucleus.
Meanwhile, according to Bohr, electrons circulate around the nucleus through several paths that have different energy levels
From these two models, Quantum Theory of Atoms developed, which states that atoms have an atomic nucleus and attract electrons with their electric forces
The combination of atoms during chemical reactions
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The difference between a calcium atom and a calcium ion
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A carbon atom
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