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

+2 +3 +4 -3 -2 -1

0

•Monatomic ion

A _____________ is an ion formed from one atom 

• The Roman numeral tells you the POSITIVE charge of the ion

Some ions have a Roman numeral with their symbol. For example,

lead II. How are the Roman numeral and charge related?

• Protons = 38• Electrons = 36 ( a +2

charge means it lost 2 valence electrons so you subtract 2e-)

Suppose strontium formed an ion. How many proton and electrons

does a strontium ion have?

• -2

Suppose sulfur formed an ion. What is the charge of a

sulfur ion?

How many valence electrons are present? _____

What ion will magnesium form? ____________

Explain why using the electron configuration.

Magnesium has the following electron configuration: 1s2 2s2 2p63s2

2

Mg+2

Loses the 3s2 valence electrons in order to satisfy its octet

•ONLY nonmetals

What elements are present for most molecular

compounds?

• Protons = 16• Electrons = 18 (it is a -2

charge so it gained 2 valence electrons so you add 2e-)

Suppose sulfur formed an ion. How many proton and electrons

does a sulfur ion have?

• ide

What is the ending of all monatomic anions?

a) Atom = sulfur; ion = __________

b) Atom = hydrogen ion = __________________

c) Atom = oxygen; ion = ___________________

Determine the name of the ion that would form from the following atoms.

sulfide

hydride

oxide

•Metals & nonmetals

What elements are present for most ionic compounds?

•Polyatomic ion

A ____________is an ion formed from 2 or more atoms

 

a) O2-2 = _________________

b)NH4+1 = ____________

c) PO3 -3 = _______________

d)Br -1 = _______________e) Fe +2 = _________________

Classify each of the following as a monatomic anion, monatomic cation, polyatomic anion, or a

polyatomic cation.polyatomic anion

polyatomic cationpolyatomic anion

Monatomic cationMonatomic anion

•Gain

Anions __________ one or more valence electrons

• +2

Suppose strontium formed an ion. What is the charge of

a strontium ion?

Another name for a positive ion is a(n) ______________________

•Cation

Li3PO3= ______lithium ion(s) : _____ phosphate ion(s)

KCl = _____ potassium ion(s) : ________ chloride ion(s)

Mg3(SO3)2 = ____ magnesium ion(s) : ____sulfite ion(s)

Ag2SO4 = _____silver ion(s) : _______ sulfate ion(s)

What is the ratio between cation(s) & anion(s) in the

following ionic compounds?3 1

1 1

3 2

2 1

Another name for a negative ion is a(n)

_____________

•Anion

How many valence electrons are present? _____

What ion will fluorine form? ______________

Explain why using the electron configuration.

Fluorine has the following electron configuration: 1s2 2s2 2p5

7

F-1

Gains 1 more valence electron in order to satisfy its octet

• LOSE

Cations __________ one or more valence electrons