Science History Flashcards
Periodic Table + Atomic Structure
Name 2 scientists who developed the periodic table
Newmans
Mendeleev
Describe how Newmans arranged elements in the periodic table
- Elements in order of atomic weight
Describe how Mendeleev arranged elements in the periodic table
FIRSTLY, arranged via atomic weight
Re-arranged into order of chemical properties
What is the law of octaves?
The law of octaves -> every eight elements share similar properties
Why did Mendeleev leave gaps in his periodic table - what did this help him do??
Predicted that there would be the discovery of new elements
Helped him predict the chemical properties of said new elements
Evaluate the usefulness of Newmans periodic table
Newmans periodic table was arranged by increasing atomic weight and had the Law of Octaves implemented . The Law stated that every eight elements had similar properties. However, this Law was only accurate for elements up to calcium and new elements would not fit the pattern which disapproves the law, making it rather un useful as it gives incorrect information
Evaluate the usefulness of Mendeleevs periodic table
The latter stage of Mendeleevs periodic table was ordered based on similarities in chemical properties, and had also left gaps. This is relevant because this would accommodate to new elements being discovered and also being able to predict their properties! This makes it useful because it was time proof and could also give you information that would have yet to be discovered!
Describe how elements are arranged in the modern periodic table
Groups (chemical properties)
Periods (increasing
proton number)
Name 5 scientists (in order) who developed models of the atom
DALTON
THOMPSON
RUTHERFORD
BOHR
CHADWICK
Dalton’s atomic model
Indivisible
Neutral
Solid sphere
Thompson’s atomic model
Plum Pudding yipeeee
Positively charge sphere
Low density
Scattered electrons
Rutherford’s atomic model
Small dense positively charged nucleus
Large empty space w/ electrons and shit
Bohr’s atomic model
Orbitals
that’s literally it dawg
CHADwick atomic model
Mass of electrons and protons DOES NOT EQUAL The total mass
so there has to be another particle
N E U T R O N S
yoyoyoyoyooyoyoyo
Compare the plum pudding model to the nuclear model of the atom
positively charged sphere / small dense positive nucleus
Scattered electrons/ electrons with orbitals
