Atomic Theory
Believed that matter was comprised of individual particles called atmos in 400 B.C
These subatomic particles make up the weight/mass of an atom
What are protons and neutrons
Make up the weighted average of an element found in nature
What are isotopes
Determines the number of Significant figures based on the number of decimal places *after* the value given.
What is adding and subtracting significant figures
Solids: g/cm3
liquid: g/mL
gas: g/L
All of these units refer to ______________
What is density?
Established the plum pudding model that states subatomic particles exist in a pudding-like state around the atom in 1808
Who is Dalton and Dalton's atomic theory?
This subatomic particle makes up for the volume of an atom, and was thought to be a ball of charge, but turns out to be a cloud of dispersed charge around the atom.
What is an electron
When an element has the same protons, but different __________. it is an isotope of that element
what are neutrons
the answer is based on the number of significant numbers during computations.
What is multiplying and dividing significant figures
What is the density of a solid with a mass of 89g and a volume of 24 mL?
3.7g/mL
Following Dalton's Atomic theory in 1897 this person discovered the 1st subatomic particle by using a Cathode Ray and came up with the mass and charge for the subatomic particle they found.
Who is J J Thompson?
Specific to each element
Same for all atoms of that element
is equal to the number of protons in an element
What is an Atomic Number
Isotopes will have a different __________ from eachother and a different number of _______.
mass and neutrons
When needing to convert from two metric units, you need to use _____________ factors equal to ___.
Conversion and 1
5
Disproved the Plum Pudding model with their experiment in 1910 and changed the idea of the model of the atom.
Who is Rutherford and the Gold Foil experiment?
The units are in amu ( or g/mol). Is usually the weighted average of all naturally occurring variations of this element.
What is atomic mass
Average Atomic Mass = _____________ average of naturally occuring isotopes.
weighted
There are _ dm in a meter.
10
What is the correct answer with the correct number of significant figures?
4.5+89.900+7=
101
in 1930 they discovered the last subatomic particle, the neutron, which strengthened the Rutherford Model of the atom, which similarly bolstered the original theory Democritus had in 400 B.C
Who is James Chadwick
Different than an atomic symbol because it carries more information regarding the element. Shows the Element symbol, the atomic number, the atomic mass, and the charge if any.
What is Nuclear Symbol?
The most abundant Chlorine atom in nature based on its close value to the average weighted mass on the periodic table.
What is Cl-35
421m = how many kilometers?
0.421 km
What is the correct answer with the right number of significant figures?
232X12X0.0056=
16