Atomic History
Ancient Greek Philosopher who believed matter was made of small particles that could not be divided called atoms
What is Aristotle?
The atomic mass of a proton and a neutron are
Don't forget your unit!!
What is 1 atomic mass unit?
The Bohr model theorized
that electrons orbited around the nucleus in fixed orbits like our solar system.
or there are different electron shells that hold only a certain amount of electrons
This group has 2 Valence Electrons, are reactive, and consists of Magnesium and Calcium.
Group 2, Alkaline Earth Metals
Define Atomic Radius
Atomic Radius is the distance between the nucleus and the outermost electron
This model of the atom has electrons embedded within a sea of positive charge
What is the Plum Pudding Model?
Fluorine has an atomic mass of 18.998 amu, an atomic number of 9. Find the number of protons and neutrons.
9 protons, 10 neutrons
Draw the Bohr Model for Helium
(answer on the whiteboard)
There should be 2 valence electrons in Helium
This group has 6 valence electrons, and contains oxygen, the most abundant element in Earth's crust.
Group 16, Oxygen Family
Define electronegativity
the tendency of an atom to attract electrons towards itself
Using the Gold foil experiment, this scientist discovered the proton and the nucleus?
What is Ernest Rutherford?
Arsenic has an atomic mass of 74.92 and an atomic number of 33. How many protons and neutrons does Arsenic have?
33 protons, 42 neutrons
Draw the Bohr model for Magnesium
(Your answer should be on the whiteboard)
Magnesium should have 2 valence electrons
This group has highly reactive elements that must be stored in Kerosene so they don't violently react with air or water. This group is highly reactive due to the presence of one Valence electron.
Group 1, Alkali Earth Metals
What is the trend for atomic radius on the periodic table
As you move top to bottom it increases. As you move right to left, it increases
The Cathode Ray experiment was used by _____ to discover _________
J.J Thomson, electrons
47 protons, 45 electrons, 61 neutrons
Draw the Bohr model for Aluminum +3
draw regular aluminum Bohr model and then take 3 electrons away
This group (s) bridges the left and right side of the periodic table. The amount of valence electrons in this group (s) varies.
Groups 3-12 Transition Metals
Describe the electronegativity trend on the periodic table
Electronegativity increases as you move left to right and bottom to top on the periodic table
This scientist discovered neutrons by bombarding Beryllium with alpha particles
What is James Chadwick?
Manganese-56 has a -2 charge. How many protons, neutrons and electrons does Manganese-56 have?
25 Protons, 31 neutrons, 27 electrons
Draw the Bohr model for Argon. What group of elements is Argon in? What is the name of that group?
There should be a full stable octet. Group 18. Noble Gasses
Noble gasses (group 18) are stable and non reactive because
They have a full octet or outer valence shell is full of 8 electrons. The noble gasses are often referred as being happy
Define ionization energy and describe the trend on the periodic table
Ionization energy is the minimum energy required to remove a loosely bound electron
Increases as you move up a group and across a row (left to right)