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Transcript of ATOMS
always negative charge of one ( -1 )
are symbolized by e
are found outside the nucleus, orbiting around the nucleus
Isotopes and Mass Number
Indicates the number of protons in the nucleus of the atom.
Particles That Make
Up an Atom
Understanding the Periodic Table
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.
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
from atomic mass
atoms as solar systems?
Living in a World
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).
Found on the top of the element/ element symbol
Found on the bottom of the element/ element symbol
from mass number
Atomic Mass= average of the mass of one element's isotopes
Charge= # of p+ (+1) + # of e- (-1)
Diagram for C-12
Diagram for C-13
Diagram for C-14
Is about 98 % of Carbon on earth
Is about 1.1% of Carbon found on earth
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
Discovered and named the neutron
Neutron is composed of one proton and one electron
Reason the nucleus stays together and does not fall apart.
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
based on the mass number
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-)
MINI QUIZ Question 1
Who conducted the gold foil experiment?
How many carbon isotopes are there? And what are their numbers?
Who discovered and named the neutron?
_ _ _
_ _ _
What are atoms composed of?
Where is the location of the atomic number on the periodic table?
What is Chemistry?
study of matter and energy
matter-what everything is made of
different types of energy
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