Download Subatomic Particles and Electron Configuration

Content Objective
● SWBAT
● Differentiate between atomic number and mass
number and what they represent
● Relate atomic number and mass number with
subatomic particles in an atom.
Language Objective
●SWBAT
● Write nuclide symbols with the atomic number and the
mass number in the appropriate place.
Subatomic Particles
 There are 3 subatomic particles –
 Protons
 Neutrons
 Electrons
Vocabulary
 Atom- from the Greek atomos=indivisible.
The atom is the smallest particle of an
element that retains the properties of that
element.
 An atom is electrically neutral
What does it mean to be
electrically neutral?
 The atom has no charge
 The number of protons = the number of electrons
Comparing Subatomic Particles
Location
Outside the nucleus
Inside the nucleus
Inside the nucleus
Atomic Number (Z)
A
Z
El
 Number of protons in the nucleus of an atom
 This number is found on the Periodic Table
 Atomic Number identifies an element
 Always a positive number (b/c it is a counting
#)
 Tells number of electrons in a neutral atom
Mass Number (A)
A
Z
El
 Definition
- the total number of protons and neutrons in the nucleus of
an atom
- mass number – atomic number = neutrons
ex. N: mass number of 14
atomic number of 7
7 neutrons
Question
 What observations can you make about atomic
numbers on the periodic table?
 Atomic Number increases as you go across the rows from
left to right.
Questions
 What is the atomic number of Chlorine?
 What can you tell me about its protons?
 What element has 20 protons?
 What is the relationship between the # protons and
the atomic number?
 They’re equal.
Complete the Chart
Element
Symbol
Atomic #
# Protons
Potassium
K
19
19
Boron
B
5
5
Sulfur
S
16
16
Yttrium
Y
39
39
Question
 What do the atomic number and the mass number
have in common?
 Both Positive integers
 Both have the same # of protons
How to find # of Neutrons
 Mass # - Atomic# = # Neutrons
 Or
 # protons + # neutrons= Mass #
 (atomic number + # neutrons) = Mass #
Complete the Chart
Atomic#
Mass#
#Protons
#Neutrons #Electrons Chemical
Symbol
9
19
9
10
9
F
14
29
14
15
14
Si
22
47
22
25
22
Ti
25
55
25
30
25
Mn
6
12
6
6
6
C
Nuclide Symbol
A
Z
 A=Mass #
 Z= Atomic #
El
Nuclide
 A specific kind of atom
 Specification of an element in terms of its
nuclear composition/structure
 Tells number of protons and number of neutrons
Chemical
Symbol
C
Nuclide Symbol
13
6
C
# protons
# neutrons
# electrons
6
[6, 7, 8]
6
6
7
6
Complete the Chart
Atomic#
Mass#
#Protons
#Neutrons #Electrons Chemical
Symbol
Nuclide
Symbol
9
19
9
10
9
F
19
9
14
29
14
15
14
Si
29
14
22
47
22
25
22
Ti
47
22
25
55
25
30
25
Mn
55
25
6
12
6
6
6
C
12
6
F
Si
Ti
Mn
C
Exit Question
 What accounts for the mass of the atom?
 # protons & # neutrons in the nucleus