Unit 4 #1 Flashcards Preview

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Flashcards in Unit 4 #1 Deck (26):
1

ionic bonds

giving and losing, positive or negative ions, (ex: sodium chloride, sodium becomes positive, chlorine becomes negative)

2

IMPORTANT THINGY!

atoms want to be a lower energy state (sometimes when two atoms come together, it is because when they are seperated, they are at a higher energy state than together)

3

covalent bond

(ex: 2 hydrogen atoms comes together and share electrons and become H2), SHARING ELECTRONS

4

bond energy

the energy required to break a bond

5

colulmobus law

used to calculate the bond energy

6

electronegativity

the ability of an atom in a molecule to attract shared electrons to itself

7

the electron negativey in a periodic table

increaes as you go RIGHT and UP

8

if the electronegativity is big....

it is ionic

9

if the electronegantivity is small/ zero

covalent

10

if the electrogneativity is intermediate

it is a polar covalent

11

dipolar

molecule that has a center of positive and center of negative charge

12

the size of atoms periodic table

-down: size increaes
-side to side: depends on atomic number and what group you are in
-AS ATOMIC NUMBER INCREASES, SIZE DECREASES

13

localized electron bonding model (LE model)

a molecule is composed of atoms that are bound together by sharing pairs of electrons using the atomic orbitals of the bond atoms (electrons in bonding pairs and lone pairs)

14

electrons in bonding pairs

shared between atoms

15

lone pairs

not shared

16

the goal of LE model

to describe the structure of valence electrons

17

"ane"

all single bonds

18

"ene"

contains one double bond

19

"yne"

contains one triple bond

20

formula charges

number of valence electrons in element minus number of valence electrons assigned to the atom in the molecule (cannot double count covalent bonds)

21

IMPORTANT THINGY #2

atoms in molecules try to achieve a formula charge as close to 0 as possible, any negative charge should go to the more electrognetaive element

22

polarity

it increases as the difference in elecronegativity increases

23

two nonmetals

form covalent bonds

24

a nonmetal and a representative-groiup metal group

binary ionic compound

25

cation

lost

26

anion

gain