CHEM 1100 Lecture Notes - Lecture 1: Ernest Rutherford, Ionic Bonding, Alpha Particle

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tommy4olson

10 Oct 2021

School

NSU

Department

Chemistry

Course

CHEM 1100

Professor

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Document Summary

1910, discovery of protons & the nucleus. Atoms have fixed energy levels, which electrons must stay inside of. Energy levels correspond to the periodic table of elements (1st: 2 electrons, Bohr models are useful for identifying valence electrons. Valence electrons: the electrons in the outer ring of an atom. The stable configuration is 8 valence electrons, elements want this. Exceptions: h, he, li: 2 / be: 4 / b: 6 / some elements: > 8 when bound. Always write cation first in an ionic bond. The net charge of an ionic bond is 0. Number of protons is the atomic number. Number of protons + neutrons in an atom = approximate mass of an atom (amu) Another representation is element - mass number . Atoms of the same element with a different number of neutrons (different mass) The decimal number you see on the pt. The number is a weighted average of all naturally-occurring isotopes of a given element.

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Valence electrons are those electrons in the outermost principal quantum level (highest n level) of an atom in its ground state. Groups 1A to 8A have from 1 to 8 valence electrons. For each group of the representative elements (1A to 8A), what is the number of valence electrons, the general valence electron configuration, a sample element from that group, and the specific valence electron configuration for that element?

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Valence electrons are those electrons in the outermost principal quantum level (highest n level) of an atom in its ground state. Groups 1A to 8A have from 1 to 8 valence electrons. For each group of the representative elements (1A-8A), give the number of valence electrons, the general valence electron configuration, a sample element in that group, and the specific valence electron configuration for that element.

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Valence electrons are those electrons in the outermost principal quantum level (highest n level) of an atom in its ground state. Groups 1A to 8A have from 1 to 8 valence electrons. For each group of the representative elements (1A-8A). Give the number of valence electrons, the general valence electron configuration, a sample element in that group, and the specific valence electron configuration for that element.

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CHEM 1100 Lecture Notes - Lecture 1: Ernest Rutherford, Ionic Bonding, Alpha Particle

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