Show:
Defining the Atom
Structure of the Nuclear Atom
Atomic Number and Mass
Isotopes
Misc.
100
This scientist believed that atoms were indivisible and indestructible.
Democritus
100
What are the three kinds of subatomic particles?
protons, neutrons, electrons
100
In a neutral atom, the atomic number also equals the number of ________________
Protons as well as electrons
100
Isotopes differ from other isotopes of the same element due to a change in what?
Neutrons
100
What on the periodic table tells you the number of protons of the element? 

Atomic number 

200
What was wrong with Democritus' idea of the atom?
It didn't explain chemical behavior and lacked experimental support.
200

Whose scientific instrument/tool helped us understand charges of electrons?

JJ Thompson

200
Atomic mass is composed of what two particles in an atom?
protons and neutrons
200

Carbon has 3 isotopes: carbon-16, carbon-17, and carbon-18.....the average atomic mass is 15.999amu. Which isotope is more abundant?

carbon-16

200

What on the periodic table tells you the state of matter of the element? 

Color of the element symbol 

300
How did Dalton transform Democritus' ideas into a scientific theory?
He conducted experiments.
300
Where are electrons found?
around the nucleus/electron orbits
300
What makes on element different from another?
The number of protons OR atomic number.
300
Isotopes are chemically alike because they have identical numbers of _____________ and _____________.
protons and electrons
300

How do you determine the number of neutrons in an atom? What is the equation?

# of neutrons = atomic mass - # of protons OR # of neutrons = atomic mass - atomic #

400
Chemical reactions occur when atoms are ____________, _____________, or _______________.
separated, joined. or rearranged
400
If an atom was the size of an NFL regulation sized football field, how big would the nucleus be?
The size of a marble 
400
How many electrons does a neutral chlorine atom have?
17 # of electrons = # of protons = atomic #
400
Regarding the carbon-12 isotope, one atomic mass unit (amu) is defined as what fraction of the carbon-12 atom?
1/12
400
What scientist did the gold-foil experiment?
Ernest Rutherford
500

Individual atoms are observable with what?

Electron microscope / scanning tunneling microscope

500

What experiment helped discover the electron? 

Cathode Ray Tube

500
How many neutrons does a neutral fluorine atom have?
10 Atomic mass - atomic # = # of neutrons 19 - 9 = 10
500
The weighted average mass takes into consideration what two values for each isotope?
mass and relative abundance
500
Given the following information, what is the average atomic mass for nitrogen? You must show work! **Round to the nearest .001 Nitrogen-14: 14.003amu, 99.63% Nitrogen-15: 15.000amu, 0.37%
14.003 x .9963 = 13.9511889 15.000 x .0037 = 0.0555 13.9511889 + 0.0555 = 14.007 amu