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UM / Chemistry / CHM 103 / Why ion is formed when a neutral atom gains or loses electrons?

Why ion is formed when a neutral atom gains or loses electrons?

Why ion is formed when a neutral atom gains or loses electrons?

Description

School: University of Miami
Department: Chemistry
Course: Chemistry for the Health Sciences I
Professor: Elliot atlas
Term: Fall 2016
Tags: Chemistry and CHM103
Cost: 25
Name: CHM103 Week 5 Class Notes (9/19-9/23)
Description: These notes cover 3.1-3.3
Uploaded: 09/23/2016
3 Pages 116 Views 1 Unlocks
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CHM103 Class Notes Week 5 (9/19­9/23)


Why ion is formed when a neutral atom gains or loses electrons?



________________________________________________________________________________ From previous sections

­ 2.4­2.8

­ Periodic Table, Characteristics of Different Groups, Electron Configuration ________________________________________________________________________________ Chapter 3: Ionic Compounds

­ 3.1 Ions

­ Alkali metals (group 1A) form compounds with halogens (group 7A) ­ Properties of these compounds include:

­ High melting points

­ Stable, white, crystalline solids

­ Soluble in water

­ Conduct electricity when dissolved in water

­ * Electricity can only flow through a medium containing

charged particles (ions) that are free to move


What is the definition of octet rule?



­ An ion is formed when a neutral atom gains or loses electrons Don't forget about the age old question of How much photosynthate is used for storage as sucrose/starch and how much is metabolized?

­ The loss of electron(s) gives a positively charged ion called a cation ­

­ The gain of electron(s) gives a negatively charged ion called an anion ­


What is reactive nonmetals?



­ Positive charge =n+; Negative charge =n­(which n is any integer)

­ 3.2 Ions and the Octet Rule Don't forget about the age old question of How have the english common law influenced the american criminal justice system?
We also discuss several other topics like What regulates the synthesis of ­galactosidase?

­ Octet rule: Main group elements tend to undergo reactions that leave them with eight valence electrons

­ E.g. Alkali metals with a single valence electron react with halogens with seven valence electrons, giving both ns2np6 configurations with eight valence electrons (i.e. noble gas electron configuration)

­ E.g. N: 1s22s22p3 → N3­: 1s22s22p6 We also discuss several other topics like When did chloroplasts evolve from cyanobacteria?

­ 3.3 Ions of Some Common Elements

­ ­ Transition metals form cations, but they can lose one or more d electrons in addition to losing valence s electrons. The octet rule is not followed. ­ Metals form cations by losing one or more electrons Don't forget about the age old question of What is meant by a consensus decision?
We also discuss several other topics like How does the icf define disability?

­ Reactive nonmetals form anions by gaining one or more electrons to achieve a noble gas configuration

­ Group 8A elements (noble gases) are unreactive

­ Ionic charges of main group elements can be predicted using the group number and the octet rule

­ E.g. 1A = X+, 2A = X2+ 

­ E.g. 5A = X3­, 6A = X2­, 7A = X­

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