Lecture 3 notes.docx - CHM153 Lecture 3 Name: Marise Daphne...

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CHM153 Lecture 3Name: Marise Daphne DibgolongoAtoms are neutral #p+=#e-Ions:-Atoms can become charged by losing or gaining electrons.-When there is a different number of protons and electrons, theatom has a net charge and is called an ion:Cation: #e-<#p+which means there is positive charge so thecharge is pawsitive ( loses e-)Anion: #e->#p+which means atom gains e-. There is morenegative charge leading to a negative charged ion. The #p+ staysthe sameOne reoccurring trend in the groups (columns) of the periodictable is how many electrons atoms tend to lose/gain.1stcolumn (1a): Alkaline metals tend to lose 1e- single valentNa atomNa+ ion11p+,11e-11p+,10e-2ndColumn (2a): tend to lose 2e-1
CHM153 Lecture 3Name: Marise Daphne DibgolongoCa atomCa ion20p+, 20e-20p+, 18e-The charge are valence: this a divalent3rdfrom right (6a):tend to gain 2e-O atomO^2- ion8p+,8e-8p+,10e-2ndfrom right (7a): tend to gain 1e-Cl atomCl- ion17p+,17e-17p+, 18e-Rightmost (8a): don’t tend to lose or gainAtoms tend to lose/gain the number of electrons that separatesthem from the noble gas column2

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Term
Summer
Professor
NoProfessor
Tags
Atom, Ion, Sodium chloride, Marise Daphne Dibgolongo

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