11/21/11 A/B DayLEQ: How can neutrons and electrons affect the characteristics of an atom?

1. What is an isotope? 2. How do we find the number of neutrons in an atom?3. How many protons and neutrons does He-5 have?4. Which atom has more mass? N-14 or N-16?5. Explain your answer for # 4! How did you know?!

Let’s Review: UNSCRAMBLE!

Protons =

Electrons = Neutrons =

POSITIVE

NEGATIVE

NEUTRAL

Let’s Review: UNSCRAMBLE!

Protons = POSITIVE

Electrons = NEGATIVE Neutrons = NEUTRAL

LET’S REVIEW: N-14

Protons =

Electrons = Neutrons =

7

7

7

PROTONS ELECTRONS

+++++++

-------

Normal Nitrogen Atom: Equal # of protons and electrons

LETS REVIEW: DRAWING ELECTRONSHelium (He) Nitrogen (N) Sodium (Na)

Period: Period: Period:

Ring(s): Ring(s): Ring(s):

1 2 3

1 2 3

How do we know how many electrons fit in each ring?

COUNT!1st Period =

2nd Period =

3rd Period =

2

8

8

Today’s LEQ: How can neutrons and electrons affect the characteristics of an atom?

By the end of today, you should be able to…

1. Model isotopes when given a specific atomic mass

2. Model ions when given specific charge

3. Tell the charge of a diagram of an atom

Focus Vocabulary:

66. Isotope67. Ion68. Valence Electron

ION

ION

Atom with a different number of electrons; has a + or — CHARGE

PROTONS ELECTRONS

+++++++

-------

Normal Nitrogen Atom: Equal # of protons and electrons

PROTONS ELECTRONS

+++++++

------

Nitrogen ION: NITROGEN ATOM THAT HAS EITHER GAINED OR LOST ELECTRONS

Missing Electrons!

NORMAL NITROGEN

NITROGEN ION

Protons: 7Neutrons: 7

Electrons: 7

Protons: 7Neutrons: 7

Electrons: 6

NORMAL NITROGEN

NITROGEN ION

Protons: 7Neutrons: 7

Electrons: 7

Protons: 7Neutrons: 7

Electrons: 8

BrainPop-Ions

Draw this in your notes…VALENCE ELECTRONS: ELECTRONS IN THE OUTERMOST RING

HOW MANY VALENCE ELECTRONS?

HOW MANY VALENCE ELECTRONS?

HOW MANY VALENCE ELECTRONS?

Which one is the ion?HELIUM

Which one is the ion?LITHIUM

ION

Which one is the ion?FLOURINE

ION

ION

Atom with a different number of electrons

N1+ = nitrogen that LOST one valence electron N2- = nitrogen that GAINED two valence electrons

Copy this in your notes…

N2-ELEMENT SYMBOL

ATOM’S CHARGE

Finding the CHARGE of an ION:

1.Draw a T-Chart

2.Count the protons

3.Count the electrons

4.Calculate the charge!

What is the charge of each atom?HELIUM

++

--

CHARGE: 0

ION? NO!

What is the charge of each atom?HELIUM

++

-

CHARGE: 1+

ION? YES!

What is the charge of each atom?LITHIUM

CHARGE: 0

---

+++

ION? NO!

What is the charge of each atom?LITHIUM

---

CHARGE: 1+

+++

ION? YES!

What is the charge of each atom?FLOURINE

---------

CHARGE: 0+++++++++

ION? NO!

What is the charge of each atom?FLOURINE

----------

CHARGE: -1+++++++++

ION? YES!

In your notebook:

1. Protons Electrons

Charge: Ion:

2. Protons Electrons

1. Protons: 6 Electrons: 5 Charge: 1+ Ion: YES

2. Protons: 8 Electrons: 8 Charge: 0 Ion: NO

3. Protons: 10 Electrons: 10 Charge: 0 Ion: NO

4. Protons: 16 Electrons: 18 Charge: 2- Ion: YES

5. Protons: 2 Electrons: 1 Charge: 1+ Ion: YES

6. Protons: 11 Electrons: 10 Charge: 1+ Ion: YES

7. Protons: 9 Electrons: 9 Charge: 0 Ion: NO

8. Protons: 5 Electrons: 7 Charge: 2- Ion: YES

9. Protons: 18 Electrons: 16 Charge: 2+ Ion: YES

10. Protons: 3 Electrons:3 Charge: 0 Ion? No

Summarizer:

1. What is an ion?2. What happens to an atom when it gains an

electron?3. What happens to an atom when it loses an

electron?4. A carbon atom has 8 electrons. Is it an ion?5. A nitrogen atom has 5 electrons. What is its

charge?