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Grade 9 Physical Science Worksheet for Section: Chemical Bonding.

Student Name:

General Information:1- Atoms can achieve a noble gas structure by gaining losing or sharing electrons

with other atoms.

2- The rule states that e!ce"t for hydrogen , an atom combines with other atoms to formbonds in order to have 8 electrons in its valence energy level ( like noble gases.

#e$is dot symbols are re!resentations of the elements which give a dot (.

for each%alence electron on the atom.

The "ewis dot symbols for the !eriod 2 elements are#

"i $e $ % & ' &e

&. ill in the "ewis dot symbols for#

)a * $r %a +i

#e$is dot structures allo$ us to understand t$o ty"es ofbonding Ionic and Co%alent .

Ionic Bonds

onic bonds are usually formed by the reaction of metals with non'metals.

am!le# ill in the "ewis dot symbols for &a and %l, below, and com!lete theshorthand electron configuration for each#

&a

%l

&ow allow each atom to com!lete its /alence energy level with 8 electrons, by losing orgaining electrons. Then write the #e$is structure for each ion and its charge.

&a

%l

+odium loses an e-because it0s a metal

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%hlorine gains an e- because it0s non-metals.

(. . se "ewis dot symbols to show the transfer of electrons between the followingatoms to form ions#

a 3 and +

b ' and $a

c  %a and

d Al and %l

e 4g and '

Co%alent Bonds

These are bonds formed between non'metal s.+o octets of valence electrons are obtained by sharing electrons, instead of gaining orlosing electrons.

 An eam!le of covalent bonding is 2, fluorine gas.

). %om!lete the "ewis dot symbols for the fluorine atoms below

*. se the "ewis diagram5structure to show how 6 and ' react to form water, 62'.

+. 7raw the "ewis diagram5structure to show how & and 6 react to form Ammonia, &6.

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,. 7raw the "ewis structure of &itrogen, &2.

-. 7raw the "ewis structure of 'ygen, '2.

. 7raw the "ewis structure of 6ydrogen, 62.

9. 7raw the "ewis structure of 6ydrogen chloride, 6%l

&/."abel (ionic or (covalent the bonds in the following com!ounds.

%'2

&a2'

 

+2

&2'

%a'

&a2%' (careful

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&&.0ill the follo$ing table to com"are bet$een Ionic and Co%alent bond

Criteria Ionic Bond Co%alent bond

1o$ does it form 2lectron transfer 

3y"e of reacted elements Nonmetal $ith non metal

Name of resultingcom"ound

4olecule

&(.Which is more stable Cl or Cl' Ion5 Why5

&). Assign the following as# onic, *olar covalent or non!olar covalent #a %-%l

b&-

c %-  

d 6-%l

e 4g-'

f %-'

g '-'

h +i-'

i &-'