Lecture 1 - Atomic Structure

Lecture 1 - Atomic Structure - Atomic Structure 1fm =...

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Atomic Structure Helium atom nucleus: 2 protons, 2 neutrons; electron cloud: 2 electrons = 10 -10 meters 1fm = 10 -15 meters
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= 10 -10 meters 1fm = 10 -15 meters Atomic Structure The basic components of the atom are the nucleus and the electron cloud . The nucleus is composed of positively charged protons , the number of which define the chemical element; and electrically neutral neutrons , the number of which determine the isotope of the element. The electron cloud is the region of space around the nucleus where electrons can be found. Electrons are found in orbitals of specific shapes. Electrons do not “orbit” the nucleus like a satellite around the earth, but are defined by their probability of being a certain distance away from the nucleus in a given orbital. Orbitals are organized into electron shells . For example, 1s2 indicates shell 1, orbital s, with 2 electrons; 2s2 indicates shell 2, orbital 2, with 2 electrons.
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Lecture 1 - Atomic Structure - Atomic Structure 1fm =...

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