Download L2: The Atom, Standard Notation and Borh

SNC2D1
Date:__________________
Name:_____________________
L2: The Atom, Standard Notation and Borh-Rutherford Diagrams
The Atom
Location:
___________
Maximum number of electrons in the 1st orbit / shell is 2;
maximum for the 2nd and the 3rd orbit / shell is 8.
________
(negatively charged)
_______
___________
This is where most of the _________ is.
(positively charged)
________
(neutral: no charge)
Subatomic Particles
Proton
Neutron
Electron
Symbol
Charge
Relative Size
Relative Mass
Location
Standard Atomic Notation
The atomic structure of an element may be represented by the following notation:
Z
Where: Z is the ____________
A
A is the atomic _______
X is the ________________
The _______ ______ = number of _______
(also = # of ___________ in a _________ atom)
The _____________ = The mass of the nucleus = number of _________ + number of _________
(rounded atomic mass)
Therefore the number of neutrons is? ________________________________
Question 1: In standard notation nitrogen would be written as
How many protons, electrons and neutrons does nitrogen have?
#p+ =
#e-=
#no=
+
#p =
#e =
#no=
Question 2: In standard notation sodium would be written as
How many protons, electrons and neutrons does nitrogen have?
#p+ =
#e-=
#no=
SNC2D1
Question 3: Fill in the chart below for each given element.
Use the periodic table (p.647 in your textbook) to help you.
The atomic number is on the top left side of each element symbol on
the periodic table and the atomic mass is below each element symbol.
For example carbon has atomic number 6 and mass of 12.
(Note: The mass is rounded to the nearest whole number.)
Element
Name
Element
Symbol
Atomic
Number
Atomic
Mass
Mass
Number
Standard
Notation
Number of
Protons
Number of
Electrons
Number of
Neutrons
Aluminum
Potassium
Sulfur
Borh-Rutherford Diagrams
Using Bohr-Rutherford diagrams is a useful way of representing the first 20 elements. Draw the Bohr- Rutherford diagram
for Lithium and Chlorine. Before you begin, write each element in standard notation.
Questions:
1. How many orbitals does each of the above elements have?
2. What is the period number (row in the periodic table) for each of the above elements?
Homework:
Read section 5.4; Complete handouts (1. standard notation; 2. Bohr-Rutherford diagrams for first 20 elements.)