Who developed the first atomic theory and what did he call atoms?
Democritus, atomos
Draw a picture of any atom, showing the three subatomic particles in the correct locations
What is a cation?
a positive ion
What are the rows and columns in the periodic table called?
Columns: groups or families
Rows: periods
What element has the highest ionization energy?
Helium
Who discovered electrons?
JJ Thompson
Which subatomic particle is the heaviest and which is the lightest?
Heaviest - neutron, proton
Lightest - electron
Give me an example of a negative ion
Any nonmetal ion
Elements that have the same properties can be found in the same _____ on the periodic table.
column or group
List the elements in order of increasing atomic radius:
Li, Ge, C
C, Li, Ge
Who discovered neutrons?
Chadwick
What are the charges on each subatomic particle:
Protons
Electrons
Neutrons
Protons - Positive
Electrons - Negative
Neutrons - Neutral
What charge does Mg get as an ion?
2+
Which elements from this list have similar properties:
Be, V, Ge, Ba
Be & Ba
Which element has the least metallic character?
Helium
Who discovered the nucleus?
Rutherford
what number do we use to find the number of protons in an element?
atomic number
What is are isotopes?
elements with the same number of protons but different number of neutrons
How many valence electrons do the halogens have?
7
Which element has the lowest electron affinity?
Francium
What is our modern atomic theory called?
Electron Cloud Model
where is the bulk of an atom's mass located?
nucleus
How many protons, neutrons, and electrons are in Calcium-39?
P: 20
N: 19
E: 20
What determines which group an element is in?
The number of valence electrons
Which three trends all follow the same arrows/pattern?
ionization energy, electron affinity, electronegativity
What happened in the gold foil experiment and what discovery did it lead to?
alpha particle beam was sent to gold foil, most passed through but some reflected off. led to nucleus discovery
how do we determine number of neutrons in an element?
Mass # - atomic #
How many protons, neutrons, and electrons are in Lead-210 3+?
P: 82
N: 128
E: 79
What are the alkaline earth metals?
Be, Mg, Ca, Sr, Ba, Ra
Which is larger: Tungsten or Lead?
Tungsten