Hank Green introduces the concept of electrons, their peculiar nature, and their role in chemistry. He discusses John Newlands' theory of periodicity, Niels Bohr's model of the atom, and the development of quantum mechanics. The video explains electrons as waves, their harmonics, and the structure of electron shells and orbitals. It covers how to write electron configurations, the concepts of ionization energy and electron affinity, and how these relate to the periodic table. The video concludes with a discussion on electron fields and their significance in understanding the universe.

Who first published a paper on the periodicity of elements before Mendeleev's periodic table?

• Erwin Schrodinger

• John Newlands

• John Dalton

• Niels Bohr

What concept did Niels Bohr introduce to describe energy levels?

• Wave-particle duality

• Electron shells

• Orbitals

• Quanta

Electrons are better described as:

• Neither particles nor waves

• Both particles and waves

• Waves

• Particles

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What does the first electron shell of an atom contain?

• An s-orbital

• A d-orbital

• A p-orbital

• A f-orbital

What rule describes the desire for most lighter elements to have 8 electrons in their outer shell?

• The quantum rule

• Bohr's rule

• The octet rule

• Dalton's rule

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What analogy is used to describe the behavior and arrangement of electrons?

• A dance

• A musical composition

• A novel

• A painting

Which orbital is added in the third electron shell?

• A p-orbital

• A d-orbital

• An f-orbital

• An s-orbital

What does the electron configuration of iron start with?

• 1s2

• 2s2

• 3s2

• 4s2

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What is ionization energy?

• Energy to move an electron within an orbital

• Energy to change electron spin

• Energy to add an electron

• Energy to remove an electron

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What fundamental concept is described by orbitals?

• Existence

• Magnetism

• Gravity

• Chemical bonding