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Questions and Answers
What are the submicroscopic particles that make up an atom?
What are the submicroscopic particles that make up an atom?
- Protons, antineutrons, and electrons
- Neutrons, positrons, and electrons
- Protons, electrons, and neutrons (correct)
- Neutrons, electrons, and isotopes
Which part of an atom is much smaller than the electron cloud?
Which part of an atom is much smaller than the electron cloud?
- Electron orbitals
- Protons
- Neutrons
- Nucleus (correct)
What is the majority of an atom's mass found in?
What is the majority of an atom's mass found in?
- Electron cloud
- Protons
- Neutrons
- Nucleus (correct)
What are the positively charged particles in an atom's nucleus?
What are the positively charged particles in an atom's nucleus?
Which particles in an atom always have a charge of +1 and a mass of 1 atomic mass unit?
Which particles in an atom always have a charge of +1 and a mass of 1 atomic mass unit?
What ancient Greek philosopher first proposed the idea of atoms as the smallest unit of matter?
What ancient Greek philosopher first proposed the idea of atoms as the smallest unit of matter?
What is the charge of protons in the nucleus of an atom?
What is the charge of protons in the nucleus of an atom?
Which model of the atom proposed a 'plum pudding' structure?
Which model of the atom proposed a 'plum pudding' structure?
What determines the atomic number of an element?
What determines the atomic number of an element?
What charge does the electron cloud of an atom possess?
What charge does the electron cloud of an atom possess?
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Study Notes
- Atoms are composed of protons, neutrons, and electrons.
- Protons are positively charged particles in the nucleus with an atomic mass of 1.
- Neutrons are uncharged particles in the nucleus with an atomic mass of 1.
- Electrons are negatively charged particles in the electron cloud with a negligible mass and a charge of -1.
- The nucleus of an atom is positively charged due to the presence of protons.
- The electron cloud is negatively charged due to the presence of electrons.
- Opposite charges of the nucleus and the electron cloud attract each other, holding the atom together.
- Atoms are created from subatomic particles during the Big Bang.
- Democritus, an ancient Greek philosopher, first proposed the idea of atoms as the smallest unit of matter.
- The study of atoms has involved various models, including the plum pudding model, the planetary model, and the cloud model.
- Atoms are made up of different elements, which are defined by the number of protons in their nucleus, or atomic number.
- Common elements include hydrogen, oxygen, and carbon, each with unique properties based on their atomic number.
- Atoms form the basis of all matter and play a crucial role in the functioning of the universe.
- The atomic number of an element determines its chemical and physical properties.
- The history of atomic study dates back to ancient Greece and has involved numerous models and theories.
- The nucleus of an atom contains protons and neutrons, and the electron cloud surrounds it, with the opposite charges attracting each other.
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