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Transcript
February Valentine’s Day-10, 2010

Objective:
 SWBAT
calculate numbers of protons, neutrons, and
electrons given mass
 SWBAT draw Bohr models for elements 1-20

Catalyst:
 Draw
a picture of Niels Bohr’s model looks like?
 Find element Zn. How many protons does it have?
Neutrons? Electrons?
Agenda







Catalyst
HW Review
Atomic Math
Practice!
Bohr Models
Practice!
Exit Question
So atoms are the smallest thing in the
universe


NO!....atoms are the smallest unit of an element
Based on the experiments we learned about, what
3 things are atoms made of?
Subatomic Particles
Key Point #1: The three main
subatomic particles are…
Protons
Neutrons
Electrons
Subatomic Particles
Subatomic
Particle
Protons
Neutrons
Electrons
Location
Relative means
compared to others
Relative Mass
NUCLEUS
1 amu
NUCLEUS
1 amu
OUTSIDE
NUCLEUS
1/1840 amu
(virtually zero!)
Relative
Charge
1+
NEUTRAL
1-
Atomic Math!

Key Point #2: Atomic math
helps us to find…
Number
of protons
Number of neutrons
Number of electrons
This helps us
distinguish
atoms from
each other!
Atomic Number is an Element’s ID Number




Who was #23 on the Chicago Bulls?
Who is #23 on the Cleveland Cavs?
Who is #9 on the Saints?
Like your social security number or a professional
athlete’s jersey number, it identifies that element
How is C different from Ca?
Key Point #3: The type of element
an atom is depends on the number
of protons in the nucleus
 Atomic Number = Number of
Protons

The
atomic number is the whole
number in the periodic table
pREVIEW of the Periodic Table
Atomic Number
Element Symbol
Atomic Mass
Not all C’s are created equal
Key Point #4: Two atoms of the same
element that have different numbers of
neutrons are called isotopes
 Although every carbon atom has 6
protons not all of them are identical
 The number of neutrons in the nucleus can
be different

Thought Exercise

Imagine you have a pile of fruit. There are
watermelons, cantaloupes and grape.
 Each
watermelon weighs 1 lb
 Each cantaloupe weighs 1 lb
 Each grape weighs 0.001 lbs

If you wanted to find the mass of the whole fruit
pile, which two fruits could you add together to find
the total mass?
 Why
can you ignore one of the fruits?
How else are isotopes different?

Look back at the relative masses of the
subatomic particles
 Which
particles affect the mass of an atom?
 Based
on your answer above, finish the equation
below:
PROTONS NEUTRONS
 Atomic Mass = ___________+___________
Atomic Mass Practice
Question #1

How many protons
does a Phosphorus (P)
atom have?
Question #2

A Fluorine (F) atom has
10 neutrons. What is
its atomic mass?
Atomic Shorthand

Each element has a name and can be abbreviated with
one or two letters


This is called the atomic symbol
The mass is written in the upper left-hand corner of the
atomic symbol
12C
 These
or
carbon-12
mean the atom is Carbon and its atomic
mass is 12
 How many protons and neutrons does this atom
have?
More Practice
Question #3

Determine the number
of protons and
neutrons in the
following isotopes:
20Ne and Ne-22
Question #4

Which element has an
atomic mass of 15 and
has 7 neutrons?
 What
if it had 8
neutrons and the same
mass as above?
Atoms

Key Point #5: All elements have no
charge (neutral) in their pure form
 This
PROTONS (+) is
means that the number of ____________
ELECTRONS (-)
equal to number of _____________.
 How
many electrons does Oxygen have?
 How many electrons does Calcium have?
Atomic Math Bylaws
1.
2.
3.
PROTONS
Atomic number = number of _______________.
Number of protons = number of
ELECTRONS
_______________(in
a neutral atom).
PROTONS
Atomic mass = number of _________________
NEUTRONS
plus the number of _________________.
Protons, Neutrons, and Electrons
For each of the following atoms determine the number of
protons, neutrons, and electrons, and the atomic mass.
 Hydrogen-1
 Copper-63
 2H
 65Cu
 Carbon-12
 Cesium-133
 13C
 Uranium-234
 14C
 235U
 12O
 238U
 13O
 9Be
 Oxygen-14
 33S
Bohr Models of Atoms

Bohr Models show
electrons floating
around the nucleus in
specific orbits.
16 p+
16 no
Sulfur: 16 protons
16 neutrons
16 electrons
Steps to Making a Bohr Model
1.
2.
3.
4.
5.
6.
7.
Determine protons, neutrons, and electrons are in the atom
Draw the nucleus (circle) with # p+ and # no inside
Draw the first energy level (circle around nucleus) and
draw up to 2 dots (electrons)
If needed, draw second energy level (second circle) and
draw up to 8 dots (electrons)
If needed, draw third energy level (third circle) and draw
up to 8 dots (electrons)
If needed, draw fourth energy level (fourth circle) and
draw up to 2 dots (electrons)
Continue drawing energy levels as needed (draw up to 32
dots on each)
Got it?

Let’s draw the Bohr model for this element.
Practice Time
Draw Bohr Models for the first 20
elements on your notes sheet
 We will do a few together first
 Remember, find the number of protons,
electrons, and neutrons first…then get
drawing!

Work Time
Complete the Atomic
Structure worksheet
Check your Atomic Math!

Exit Question
1.
Ruthenium has an atomic number of
44. It has an atomic mass of 101.
How many protons, neutrons, electrons
does a neutral atom of Ruthenium
have?