Ions 11/3/2008 Use your periodic table to answer the

following questions about Sodium (Na) and Chlorine (Cl): What is the atomic number? What is the atomic mass? How many protons do they have? How many electrons do they have? How many neutrons do they have?

Review In an uncharged atom, the number

of protons is equal to the number of ________________. Electrons

An uncharged atoms has NO charge. Why? Protons = electrons

In an uncharged atom, the number of protons is the same as the number of ____________. electrons

An uncharged atom has NO charge. Why? Protons = electrons

Ions 10/30/08

Uncharged Atoms

Protons = electronsNO charge (zero charge)

IonsElectrons can be added or removed from an atom.

If the number of electrons is not equal to the number of protons, the atom is no longer uncharged

Ions The ions of an element have an overall charge The number of protons does not equal the number of electronsAtomic number always tells us the number of protons

The number of electrons is what changes

In an uncharged atom, the number of protons is the same as the number of ____________. electrons

An uncharged atom has NO charge. Why? Protons = electrons

Ions 10/30/08

Uncharged Atoms

Protons = electronsNO charge (zero charge)

Ions Ions have an overall charge Protons electrons # of protons = atomic number # of electrons changes

Ions Overall Charge = # protons - # electrons

If an ion has more protons than electrons, the overall charge will be positive.

If an ion has more electrons than protons, the overall charge will be negative.

In an uncharged atom, the number of protons is the same as the number of ____________. electrons

An uncharged atom has NO charge. Why? Protons = electrons

Ions 10/30/08

Uncharged Atoms

Protons = electronsNO charge (zero charge)

Ions Ions have an overall charge Protons electrons # of protons = atomic number # of electrons changes

Overall Charge

Overall charge = # protons - # electrons protons electrons overall charge is positive protons electron overall charge is negative

In an uncharged atom, the number of protons is the same as the number of ____________. electrons

An uncharged atom has NO charge. Why? Protons = electrons

Ions 10/30/08 Overall

Charge Examples

Ex. 1: If an atom has 18 protons, 18 neutrons, and 17 electrons, what will the overall charge be?

Overall charge = protons – electrons = 18p+ - 17e- = +1

Ex. 2: If an atom has 18 protons, 18 neutrons, and 19 electrons, what will the overall charge be?

Overall charge = protons – electrons

= 18p+ - 19e- = -1

In an uncharged atom, the number of protons is the same as the number of ____________. electrons

An uncharged atom has NO charge. Why? Protons = electrons

Ions 10/30/08 Overall

Charge Examples

Ex. 3: If an atom has 18 protons, 18 neutrons, and 18 electrons, what will the overall charge be?

Overall charge = protons – electrons = 18p+ - 18e-

= 0 NOT an ion (protons = electrons)

Ions Ions are abbreviated with the element symbol and the charge.

Ex. 1: An ion of Potassium (K) has a +1 charge: it is abbreviated as K+.

Ex. 2: An ion of Iodine (I) has a -1 charge: it is abbreviated as

Ions Ions are abbreviated with the element symbol and the charge.

Ex. 1: An ion of Potassium (K) has a +1 charge: it is abbreviated as K+.

Ex. 2: An ion of Iodine (I) has a -1 charge: it is abbreviated as I-

In an uncharged atom, the number of protons is the same as the number of ____________. electrons

An uncharged atom has NO charge. Why? Protons = electrons

Ions 10/30/08 Overall

Charge Examples

Ex. 3: If an atom has 18 protons, 18 neutrons, and 18 electrons, what will the overall charge be?

Overall charge = protons – electronsOverall charge = 18p+ - 18e- Overall charge = 0 NOT an ion (protons = electrons)Symbols for

ionsElement symbol + charge Potassium (K) with a +1 charge = K+

Iodine (I) with a -1charge = I-

Ions An ion of Sulfur has a -2 charge: it is abbreviated as____.

Ions An ion of Sulfur has a -2 charge: it is abbreviated as S-

2.

An ion of Calcium has a +2 charge: it is abbreviated as _____

Ions An ion of Sulfur has a -2 charge: it is abbreviated as S-

2.

An ion of Calcium has a +2 charge: it is abbreviated as Ca+2

Calculating Subatomic Particles

Atomic number = protons

# Electrons = # Protons – Overall Charge

In an uncharged atom, the number of protons is the same as the number of ____________. electrons

An uncharged atom has NO charge. Why? Protons = electrons

Ions 10/30/08 Examples Ex. 1: If an ion has an atomic

number of 13, a mass number of 26, and an overall charge of +1, find the following information:

# Protons:

In an uncharged atom, the number of protons is the same as the number of ____________. electrons

An uncharged atom has NO charge. Why? Protons = electrons

Ions 10/30/08 Examples Ex. 1: If an ion has an atomic

number of 13, a mass number of 26, and an overall charge of +1, find the following information:

# Protons: 13# Electrons:

In an uncharged atom, the number of protons is the same as the number of ____________. electrons

An uncharged atom has NO charge. Why? Protons = electrons

Ions 10/30/08 Examples Ex. 1: If an ion has an atomic

number of 13, a mass number of 26, and an overall charge of +1, find the following information:

# Protons: 13# Electrons: # protons – charge 13 – (1)

12

In an uncharged atom, the number of protons is the same as the number of ____________. electrons

An uncharged atom has NO charge. Why? Protons = electrons

Ions 10/30/08 Examples Ex. 1: If an ion has an atomic

number of 13, a mass number of 26, and an overall charge of +1, find the following information:

# Protons: 13# Electrons: # protons – charge 13 – (1)

12# neutrons:

In an uncharged atom, the number of protons is the same as the number of ____________. electrons

An uncharged atom has NO charge. Why? Protons = electrons

Ions 10/30/08 Examples Ex. 1: If an ion has an atomic

number of 13, a mass number of 26, and an overall charge of +1, find the following information:

# Protons: 13# Electrons: # protons – charge 13 – (1)

12# neutrons: mass # - # protons 26 – 13

13

Examples (Left Page) Ex. 2: If an ion has an atomic number of 13, a

mass number of 26, and an overall charge of -2, find the following information: # Protons: # Electrons: # Neutrons:

Examples (Left Page) Ex. 2: If an ion has an atomic number of 13, a

mass number of 26, and an overall charge of -2, find the following information: # Protons: 13 # Electrons: # Neutrons:

Examples (Left Page) Ex. 2: If an ion has an atomic number of 13, a

mass number of 26, and an overall charge of -2, find the following information: # Protons: 13 # Electrons: 15 # Neutrons:

Examples (Left Page) Ex. 2: If an ion has an atomic number of 13, a

mass number of 26, and an overall charge of -2, find the following information: # Protons: 13 # Electrons: 15 # Neutrons: 13

Examples (Left Page) Ex. 2: If an ion has an atomic number of 13, a

mass number of 26, and an overall charge of -2, find the following information: # Protons: 13 # Electrons: 15 # Neutrons: 13

Ex. 3: If an ion has an atomic number of 13, a mass number of 26, and an overall charge of -1, find the following information: # Protons: # Electrons: # Neutrons:

Examples (Left Page) Ex. 2: If an ion has an atomic number of 13, a

mass number of 26, and an overall charge of -2, find the following information: # Protons: 13 # Electrons: 15 # Neutrons: 13

Ex. 3: If an ion has an atomic number of 13, a mass number of 26, and an overall charge of -1, find the following information: # Protons: 13 # Electrons: # Neutrons:

Examples (Left Page) Ex. 2: If an ion has an atomic number of 13, a

mass number of 26, and an overall charge of -2, find the following information: # Protons: 13 # Electrons: 15 # Neutrons: 13

Ex. 3: If an ion has an atomic number of 13, a mass number of 26, and an overall charge of -1, find the following information: # Protons: 13 # Electrons: 14 # Neutrons:

Examples (Left Page) Ex. 2: If an ion has an atomic number of 13, a

mass number of 26, and an overall charge of -2, find the following information: # Protons: 13 # Electrons: 15 # Neutrons: 13

Ex. 3: If an ion has an atomic number of 13, a mass number of 26, and an overall charge of -1, find the following information: # Protons: 13 # Electrons: 14 # Neutrons: 13

Examples (Left Page) Ex. 4: Using your periodic table,

find the following information for K+: Atomic #: Overall Charge: # p+: #e-: # n0: Mass #:

Examples (Left Page) Ex. 4: Using your periodic table,

find the following information for K+: Atomic #: 19 Overall Charge: # p+: #e-: # n0: Mass #:

Examples (Left Page) Ex. 4: Using your periodic table,

find the following information for K+: Atomic #: 19 Overall Charge: +1 # p+: #e-: # n0: Mass #:

Examples (Left Page) Ex. 4: Using your periodic table,

find the following information for K+: Atomic #: 19 Overall Charge: +1 # p+: 19 #e-: # n0: Mass #:

Examples (Left Page) Ex. 4: Using your periodic table,

find the following information for K+: Atomic #: 19 Overall Charge: +1 # p+: 19 #e-: 18 # n0: Mass #:

Examples (Left Page) Ex. 4: Using your periodic table,

find the following information for K+: Atomic #: 19 Overall Charge: +1 # p+: 19 #e-: 18 # n0: 20 Mass #:

Examples (Left Page) Ex. 4: Using your periodic table,

find the following information for K+: Atomic #: 19 Overall Charge: +1 # p+: 19 #e-: 18 # n0: 20 Mass #: 39

Examples (Left Page) Using your periodic table, find

the following information for S2-: Atomic #: Overall Charge: # p+: #e-: # n0: Mass #:

Examples (Left Page) Using your periodic table, find

the following information for S2-: Atomic #: 16 Overall Charge: # p+: #e-: # n0: Mass #:

Examples (Left Page) Using your periodic table, find

the following information for S2-: Atomic #: 16 Overall Charge: -2 # p+: #e-: # n0: Mass #:

Examples (Left Page) Using your periodic table, find

the following information for S2-: Atomic #: 16 Overall Charge: -2 # p+: 16 #e-: # n0: Mass #:

Examples (Left Page) Using your periodic table, find

the following information for S2-: Atomic #: 16 Overall Charge: -2 # p+: 16 #e-: 18 # n0: Mass #:

Examples (Left Page) Using your periodic table, find

the following information for S2-: Atomic #: 16 Overall Charge: -2 # p+: 16 #e-: 18 # n0: 16 Mass #:

Examples (Left Page) Using your periodic table, find

the following information for S2-: Atomic #: 16 Overall Charge: -2 # p+: 16 #e-: 18 # n0: 16 Mass #: 32

SUMMARY Take 3 minutes to write a summary of

today’s notes (I will be stamping). Work on your HW Packet – ions section!