Formulas
Review
Place the ionic charges for the following
groups on the Periodic Table: group 1, group 2,
group 13, group 14, group 15, group 16, group
17 and group 18
+1
0
+2
+3 +4 -3 -2 -1
A _____________ is an ion formed
from one atom
• Monatomic ion
Some ions have a Roman numeral with
their symbol. For example, lead II. How
are the Roman numeral and charge
related?
• The Roman numeral tells
you the POSITIVE
charge of the ion
Suppose strontium formed an ion.
How many proton and electrons
does a strontium ion have?
• Protons = 38
• Electrons = 36 ( a +2 charge
means it lost 2 valence
electrons so you subtract
2e-)
Suppose sulfur formed an ion. What
is the charge of a sulfur ion?
•
-2
Magnesium has the following
electron configuration: 1s2 2s2 2p63s2
2
How many valence electrons are present? _____
+2
Mg
What ion will magnesium form? ____________
Explain why using the electron configuration.
Loses the 3s2 valence electrons in
order to satisfy its octet
What elements are present for
most molecular compounds?
• ONLY nonmetals
Suppose sulfur formed an ion. How
many proton and electrons does a
sulfur ion have?
• Protons = 16
• Electrons = 18 (it is a -2
charge so it gained 2
valence electrons so you add
2e-)
What is the ending of all
monatomic anions?
• ide
Determine the name of the ion that
would form from the following
atoms.
a)
Atom = sulfur; ion
=
sulfide
__________
hydride
b)
Atom = hydrogen ion = __________________
c)
Atom = oxygen; ion = ___________________
oxide
What elements are present for
most ionic compounds?
• Metals & nonmetals
A ____________is an ion formed
from 2 or more atoms
• Polyatomic ion
Classify each of the following as a
monatomic anion, monatomic cation,
polyatomic anion, or a polyatomic
cation.
polyatomic anion
a) O -2 = _________________
2
b)
c)
d)
e)
cation
NH4+1 = polyatomic
____________
anion
PO3 -3 = polyatomic
_______________
Monatomic anion
Br -1 = _______________
Monatomic cation
Fe +2 = _________________
Anions __________ one or more
valence electrons
• Gain
Suppose strontium formed an ion.
What is the charge of a strontium
ion?
• +2
Another name for a positive ion
is a(n) ______________________
• Cation
What is the ratio between cation(s)
& anion(s) in the following ionic
compounds?
3
1 phosphate ion(s)
Li3PO3= ______lithium
ion(s) : _____
1
1
KCl = _____ potassium ion(s) : ________ chloride ion(s)
3
2
Mg3(SO3)2 = ____ magnesium ion(s) : ____sulfite ion(s)
1 sulfate ion(s)
2
ion(s) : _______
Ag2SO4 = _____silver
Another name for a negative ion
is a(n) _____________
• Anion
Fluorine has the following electron
configuration: 1s2 2s2 2p5
7
How many valence electrons are present? _____
F-1
What ion will fluorine form? ______________
Explain why using the electron configuration.
Gains 1 more valence electron in
order to satisfy its octet
Cations __________ one or more
valence electrons
• LOSE