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Questions and Answers
Atoms are the smallest building units of matter.
Atoms are the smallest building units of matter.
True (A)
The nucleus of an atom is found in the electron.
The nucleus of an atom is found in the electron.
False (B)
Electrons move at high speed around the nucleus.
Electrons move at high speed around the nucleus.
True (A)
The atomic number of an element is equal to its mass number.
The atomic number of an element is equal to its mass number.
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Energy levels refer to the movement of electrons around the nucleus.
Energy levels refer to the movement of electrons around the nucleus.
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Molecules are made up of atoms.
Molecules are made up of atoms.
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Study Notes
Atomic Structure of Matter
- Atoms are the smallest building units of matter.
- Atoms are made up of a nucleus and electrons that revolve around it at high speed.
Atomic Construction
- Atoms consist of two main parts:
- Nucleus (found in the core, with a positive charge and mass)
- Electrons (revolve around the nucleus with a negative charge)
Expressing an Atom of Any Element
- Atomic number: represents the number of protons in the nucleus of an atom
- Mass number: represents the total number of protons and neutrons in the nucleus of an atom
Electron Movement
- Electrons move around the nucleus in energy levels
- The movement of electrons around the nucleus is related to energy levels
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