12 Questions
What is the approximate diameter of an atom?
$10^{-10}$ m
What is the composition of the nucleus of an atom?
Protons and neutrons
Who proposed the theory that matter consists of indivisible particles called atoms?
Democritus
Which particles are much heavier and constitute the majority of an atom's mass?
Protons
What is the historical significance of Democritus' theory on atoms?
First proposed the concept of indivisible particles called atoms
How small are the nuclei compared to the size of the atom?
About 100,000 times smaller
What is the main component of an atom's nucleus?
Neutrons and protons
Which part of an atom occupies almost all of the atom's volume?
Electrons
How does Democritus describe atoms in his theory?
Indivisible particles
Which part of an atom is about 100,000 times smaller than the diameter of the atom?
Nucleus
What is the main difference between the nucleus and the rest of the atom?
Nucleus is positively charged
What is the approximate diameter of the nucleus of an atom?
$10^{-15}$ m
Explore the development of modern atomic theory and the inner structure of atoms, including the composition of the nucleus with protons and neutrons, and the surrounding electrons. Learn about the mass distribution within an atom and how electrons occupy the majority of its volume.
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