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UM / Chemistry / CHEM 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 Life Sciences I (Lecture)
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 41 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?



Don't forget about the age old question of What is the process by which molecules spread from high concentration to low concentration?

­ An ion is formed when a neutral atom gains or loses electrons

­ The loss of electron(s) gives a positively charged ion called a cation ­ We also discuss several other topics like Why are obligations under civil code juridical necessity?

­ 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

­ 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) Don't forget about the age old question of What does the word "phagocytosis" mean in medical terms?
If you want to learn more check out On which site of dna do transcriptional regulators bind?

­ E.g. N: 1s22s22p3 → N3­: 1s22s22p6 

­ 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

­ 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+ Don't forget about the age old question of What is the process of being socialized to a particular culture called?
We also discuss several other topics like What is the function of chaperonins?

­ E.g. 5A = X3­, 6A = X2­, 7A = X­

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