Study sets, textbooks, questions
Upgrade to remove ads
Unit 5 Chemistry Exam
Terms in this set (62)
How are electrons arranged in ionic compounds and in covalent (molecular compounds)
Assign charge to ions
Write and name compounds
What are the three basic types of bonds
1. Ionic bond -"losing or gaining" Attractive forces between ions. Exist in ionic compound. If it loses an electron the other electron would gain and then this would form an ionic bond.
2. Covalent bond-electrons are shared. Exist in molecules, or covalent compounds.
3. Metallic bond-exist in metals. Due to the outermost electron and they will move in the electrical current.
Electrons on the outermost energy level of an atom. For A groups.
the representation of an atom that shows valence electrons as dots around the symbol of the element
positively charged ion (lost electrons)
negatively charged ion (gained electrons)
Chemical abbreviation + charge. Ex: Cl2+
takes less energy than gaining electrons
it will lose an electron making it a positive charge called a cation
Share electrons most of the time.
It will gain an electron making it a negative charge called anion
noble gases"do not react"
can carry 1+or 1-
Carry equal amount of electrons. See how many electrons are there and see if they are equal.
For ex: Na+ because it is in group 1A it will lose that electron. You calculate the number of electrons and subtract the # it is losing in this case 11-1=10
Ex: Mg 12-2=10e
These four would be considered isoelectronic species.
positive ions (cations)
Non metals form
negative ions (anions)
covalent compound also called molecular compound. Typically share electrons.
cross down rule
1. Write down the ion.
2. Cross over
( Mg3N2. Erase charges and just leave like that
=Mg2 O2. Since they are the same divide by 2 and you will get MgO
Metallic atoms form
positive ions (cations)
form negative ions (anions)
Polyatomic ions form
Ionic compounds. For example: NH4+ Cl-
If it formed only by nonmetals we suspect it to be
covalent compound=share electrons.
Is a molecule. The atoms share electrons.
more than one element.
Molecules with 2 VSEPR GROUPS
It is linear
left to right it increases
bottom to top it increases
Atomic size =Atomic radii
Decreases as one goes from left to right at the same period, increases from top to bottom in the same group.
Periods indicate how many
so period 1 has 1 shell
period 2 has 2 shells
and so on.
when the attraction increases
the size of the atom gets smaller. The electrons will be closer to the nucleus.
1. Distinguish between ionic compound and covalent compound
Ionic will most likely contain metals.
Compound will most likely contain non metals.
Distinguish between fixed charge metal and variable charge metal
Fixed metals: 1A 2A 3A and ZN,AG,CD.
Variable charge metals: All B groups except (ZN,AG,CD)
1. Copper (I) =
2. Copper (II)=
1. Copper (I) =Cuprous
2. Copper (II)= Cupric
memorize polyatomic ions
Binary ( compound)
means there are two different elements.
mono, di, tri, tetra, penta, hexa, hepta, octa, nona, deca
electrostatic attraction between ions,
in ionic compounds
, after losing or gaining
electrons among atoms.
Is formed by outmost
electrons of one metal atom
wander around many metal
Valence electron No. of an A group
element = ?
ts group no.
Elements (from A groups, main groups) in the same group have
the same valence electrons (except He)
after losing or gaining electron(s), an atom becomes an
after gaining electrons, the atom becomes a negatively
charged ion. The number as the superscript is the number of
after losing electrons, the atom becomes a positively
charge ion. The number as the superscript is the number of
What is the central concept behind VSEPR?
electron pairs repel each other to be as far as possible from each other. After reaching a balance, it forms a shape
Electron Domains are also called electron groups, but not electron pairs!!
Each electron pair is an electron domain.
•A double or triple bond, is counted as one electron domain
Molecules with three VSEPR electron groups
Three groups, without electron pairs, is trigonal planar
Three groups, with one electron pair, is bent
Four groups, without electron pairs, is tetrahedral
Four groups, with one electron pair, is trigonal pyramidal
Four groups, with two electron pairs, is bent
electronegativity increases as you go
from left to right across a row.
...from the bottom to the top of a column
Binary ionic compound
: An ionic compound that contains exactly
. CaBr2, MgO, NaCl, etc
Fixed charge: one element has only one kind of charge
Group I, II, IIIA metals have fixed charges
one element has more than one kind of charge
Transitional metals (metals in B
groups) tend to have variable charges.
(exception: Zn and Ag, which means,
Zn and Ag are not variable charge
a compound composed of three elements
1. Which of the following statements concerning double covalent bonds is
D) They always involve the sharing of 2 electron pa
Other sets by this creator
Chapter 3: Adjusting Accounts for Financial Statem…
Unit 2 Bio exam
Pre-Chem unit (III) Exam
Recommended textbook solutions
Quantitative Chemical Analysis
Daniel C. Harris
Chemistry: The Central Science
Bruce Edward Bursten, Catherine J. Murphy, H. Eugene Lemay, Matthew E. Stoltzfus, Patrick Woodward, Theodore E. Brown
Chemical Reaction Engineering