Atomic Theory
What is the basic unit of matter called?
Atom
Where are the neutrons located in an atom?
Inside the nucleus.
What subatomic particle orbits the nucleus?
Electrons
How do you find the atomic number of an element or atom?
Count the number of protons
Which number on the periodic table tells you the number of valence electrons?
Group number
The idea that atoms are the smallest unit of matter that cannot be divided into smaller pieces was who's theory?
John Dalton
You find these in a probability cloud around the nucleus
electron
What makes up all of the universe by combining in different ways and are constantly reused and recombined in different ways to make EVERYTHING
Atoms
How do you find the mass number of an element or atom?
Add the total of protons and neutrons. Thats the mass of the atom
What number on the periodic table tells you how many orbitals an atom has?
Period number
Which scientist's atomic model represents how planets orbit the sun?
Niels Bohr
Which subatomic particles are considered to have the same mass
Protons, neutrons
Why do we update and modify theories like the atomic theory?
New evidence often from new technology
How many electrons are in potassium?
19
How many valence electrons does Tellurium have?
6 valence electrons
Which scientist is known for discovering the electron?
J.J. Thomson
What type of charge does a proton have?
Positive
JJ Thomson's atomic model shows the atom as a sphere with a positive charge containing negatively charged electrons embedded inside it.
Plum Pudding Model
If the atomic number of an atom is 84 and it has 39 neutrons, what is it's mass number?
123
What is the electron configuration of Argon in the ground state? Hint: Think Bohr models.
2, 8, 8
Which scientist is known for coming up with the basics of the atom calling it "atomos"?
Democritus
What is the charge of a neutron?
0 (neutral)
What type of charge do electrons have?
negative
How do you find the number of neutrons in an atom?
Mass # - # of protons (or atomic #)
What is the average atomic mass of Boron using information below?
B = Mass of 10.1 and %abundance of 19.9
B = Mass of 11.01 and %abundance of 80.1
10.8