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ATOMS

For TRiO UBMS Saturday Academy
by

Myra M

on 8 October 2015

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Transcript of ATOMS

Neutrons
Electrons
always negative charge of one ( -1 )
are symbolized by e
are found outside the nucleus, orbiting around the nucleus
almost weightless
Isotopes and Mass Number
Atomic Mass
Atomic Number
Indicates the number of protons in the nucleus of the atom.
Ernest Rutherford
J.J Thomson
Protons
Particles That Make
Up an Atom
Understanding the Periodic Table
Important Scientists
ATOMS
Bohr's Model
Niels Bohr
Bohr's Model 1913 for Hydrogen Atom ONLY
Despicts the atom as a small, positively charged nucleus surrounded by the elctrons that travel in circular orbits around the nucleus similar structure to the solar system.

Sydnee Blueitt
Jazmin Guzman
William Levaro
Julian Mejia
Myra Munoz
Sam Seto


are always found in the nucleus
are always positive charge
always positive one ( 1 )
are symbolized as p
Electrically neutral subatomic particles found in the nucleus.
are symbolized as n
Neutral charge (neither positive nor negative)
almost same weight of proton, 1
- Atoms of an element with different mass numbers due to different numbers of neutrons.

-Mass number= # of protons + # of neutrons

- Mass number is
DIFFERENT
from atomic mass
+
atoms as solar systems?
Living in a World
of Chemistry
Niels
Bohr
Learning Objectives
By the end of the chapter, we hope you have a better understanding of:

1) What atoms are composed of
2) Who contributed to further understand atoms
3) What an isotope is and what makes it different from regular atoms
4) How orbitals/ electron configurations determines the atom's chemistry
5) Understanding the arrangement of the periodic table
Organization of the Periodic Table
Elements can be metals, non metals, or metalliods (or semi- metals).
Metals
Non Metals
Semi- Metals
PERIODIC TABLE
C
6
12.01
C
6
12.01
Found on the top of the element/ element symbol
Found on the bottom of the element/ element symbol
Is
DIFFERENT
from mass number
Atomic Mass= average of the mass of one element's isotopes
C-12
C-13
C-14
Example:
Diagraming Isotopes:
X
KEY:
element symbol
atomic number
mass number
Charge= # of p+ (+1) + # of e- (-1)

Z
A
Charge
Diagram for C-12
C
1 2
6
Zero Charge
C

1 3

6
Zero Charge
Diagram for C-13
KEY:
element symbol
atomic number
mass number

KEY:
element symbol
atomic number
mass number

C
Diagram for C-14
No Charge
1 4
6
KEY:
element symbol
atomic number
mass number

James Chadwick
Fact:
Is about 98 % of Carbon on earth
Fact:
Is about 1.1% of Carbon found on earth
Fact:
Is about 0.07% of Carbon found on Earth
Alpha Particles ( +2 ) Helium like
Beta Particles ( -1 )
Gama Rays ( 0 )
Located the proton
Discovered & Named Electron
Cathode Ray Tube
Plum-Pudding Model
Discovered and named the neutron
Neutron is composed of one proton and one electron
Reason the nucleus stays together and does not fall apart.
e -
Hydrogen
Cathode Ray Tube
- Beam from the cathode ray tube deflected toward positive charged plate.
- Found that atoms contained negative charged particles with a constant mass-to-charge ratio
Average Weight
based on the mass number
o
amu
Bohr's Model Cont'd
Quantum is the smallest increment of energy, for example, in an atom emitting or absorbing radiation.

Ground state is the condition of an atom in which all electrons are in their normal, lowest energy levels.

Excited state is an unstable, higher energy state of an atom.
H ( 1 e-)
ENERGY
MINI QUIZ Question 1
Who conducted the gold foil experiment?
MINI QUIZ
QUESTION 2
How many carbon isotopes are there? And what are their numbers?
MINI QUIZ
Question 3
MINI QUIZ
QUESTION 4
MINI QUIZ
QUESTION 5
Who discovered and named the neutron?

_
_
A. Thomson
B. Chadwick
C. Bohr
D. Rutherford
_
_ _ _
_ _ _
_
What are atoms composed of?
1s
Where is the location of the atomic number on the periodic table?
2s
2p
3s
3p
4s
-
What is Chemistry?
study of matter and energy
matter-what everything is made of
different types of energy
light
heat
sound
What is an atom?
the smallest components of an element
they consist of...
ANSWERS TO MINI QUIZ
1. Ernest Rutherford

2. 3; C-12, C-13, C-14

3. (B) Chadwick

4. protons, neutrons, electrons

5. Above the atomic symbol
Full transcript