Bellwork (Get out Study Guide..and..)

1) Tear out sheet of paper from notebook.

2) Come up with three possible test questions. Write the answer on the back.

3) Trade with neighbor and see if they can answer them (without you telling them the answer

Study Guide: first page• Atomic Mass: mass of a specific isotope of an element

• Atomic Number: the number of protons in an element

• Mass Number: Protons + Neutrons

• Isotopes: forms of elements that have different number of neutrons

• Ions: charged atoms

• Valence electrons: electrons in the outermost shell

Study Guide: First Page Charge Location Mass

Proton Positive

 Nucleus  1 atomic

mass unit

Neutron Neutral

 Nucleus  1 atomic

mass unit

Electron Negative

 Cloud  0.00054 amu

(small!)

Study Guide: First Page• Which particle defines the element? • Number of protons

• What charge does the nucleus of an atom normally have? • Positive

• What does it mean for an atom to be neutral? (Explain using the words proton, neutron, electron)• No charge. Number of protons= electrons. Neutrons

are not charged.• How are the electrons arranged in an atom? • In shells or orbitals based on energy level.

•Knowing that every periodic table is different, how do I tell which one thing is the atomic number?• It is the whole number (no decimals).

•Knowing that every periodic table is different, how do I tell which one thing is the atomic mass?• It is the decimal number. It is usually larger

than the atomic number.

• If you know an elements Atomic number, what else do you know about the element? (Assume the element is neutral)•Number of protons. If the element is

neutral, also the number of electrons.

•How do you get the mass number from the periodic table?•Round the average atomic mass.

Most of the time, though, you should add protons and neutrons.

Study Guide: First Page• Electrons do not travel in an orbit.

Explain this statement, using the words orbit, orbital, electron cloud, and energy level.

• Electrons are found approximately in the electron cloud and travel very quickly in orbits. They are found at different energy levels. Electrons closer to the nucleus have less energy because they are strongly attracted to the nucleus.

Isotopes and Ions• What do the numbers after the name of an element

represent? Ex. Magnesium – 26•  Mass number. Ex) 26 is the number of protons plus

neutrons

In the example to the right, why don’t I have to include the number of protons before Magnesium? Ex. Magnesium – 26

The number of protons is always the same for a specific element (it is the atomic number)

Isotopes and Ions• Assume you have these 2 elements: 55

25Mn and 5625Mn

• How are these elements different from each other? •   Different mass numbers

• What do we call these elements? •   Isotopes

• How would you name each element? Manganese-55 and Manganese-56

Isotopes and IonsElement/Isotope Information

Write the Isotope Notation

Name the Element/Isotope

p = 19 , e= 19, n = 20

 

3919 K

 

Potassium-39

p=75, e=75, n = 111

18675 Re

 

Rhenium- 186p = 18, e = 18, n = 22

 4018 Ar

 Argon-40

•What is a cation?

• Positively charged atom (has lost electrons)

•Does a cation have a positive or negative charge?•Positive

•What is an anion?•Negatively charged atom (has gained electrons)

•Does an anion have a positive or negative charge?•Negative

substance symbol

Atomic number

=protons

Mass number

(P+N)

Protons Neutrons

(mass number- atomic number)

Electrons

Neutral orIon

IsotopeNotation

Aluminum Al-1 13 27 13  (27-13)

14

 (13+1)

14

Ion

27

13 Al -1

Carbon C 6 (6 + 6)

12

6 6 6

NeutralP=E

12

6   C

Sodium Na+1 11 23 11 12 10

IonLost an electron (+)

23

11 Na+1

substance symbol

Atomic number

=protons

Mass number

(P+N)

Protons Neutrons

(mass number- atomic number)

Electrons

Neutral orIon

IsotopeNotation

Tin

Sn

50 119 50  119-50= 69

50

NeutralP=E

      119

       50 Sn

Barium Ba2+ 56 138 56 138-56= 82

54Ion

Lost two electrons

138

   56 Ba 2+

IodineI

53 76+53=129

53 76 53NeutralP=E

     12953   I 

substance symbol

Atomic number

=protons

Mass number

(P+N)

Protons Neutrons

(mass number- atomic number)

Electrons

Neutral orIon

IsotopeNotation

Oxygen O2- 8 8+6=14

8 6 10

2- ion

14

8 O2-

Magnesium

Mg2+ 12 24 12 12 10

2+ ion

24 Mg +212

Chlorine Cl1- 17 37 17 2018

1- ion37

17 Cl1-

substance symbol

Atomic number

=protons

Mass number

(P+N)

Protons Neutrons

(mass number- atomic number)

Electrons

Neutral orIon

IsotopeNotation

BromineBr 35

7535 40

35

Neutral

75

35 Br