metals that are mixed with one or more other element
usualy other metals
What is an alloy?
100
Carl Wilhelm Scheele
Who discovered chlorine?
100
October 23 from 6:02 a.m. to 6:02 p.m
When is Mole Day?
200
Group II
Period 5
What is strontium?
200
Formulated the Periodic Law, and used the periodic table to predict properties of elements yet to be discovered.
Who is Mendeleev?
200
A pure substance that have only one kind of atom
What is an element?
200
Discovered radium
Who is Marie Curie?
200
The branch of science concerned with the substances of which matter is composed, the investigation of their properties and reactions, and the use of such reactions to form new substances.
What is Chemistry?
300
Group VI
Period 2
What is nitrogen?
300
Formulated Atomic Theory
Who is Democritus?
300
It is compose of more than one kind of atom
What is a compound?
300
Sir Humphry Davy
Who discovered calcium?
300
Shaped like a dumb-bell
What shape is a p-orbital?
400
Group VII
Period 2
What is fluorine?
400
Conducted the gold foil experiment
Who is Ernest Rutherford?
400
The pure substances are distributed uniformly through out the mixture
What is an homogenous mixture?
400
Martin Heinrich Klaproth
Who discovered uranium?
400
The most stable arrangement of electrons in sublevels and orbitals
What is an electron configuration?
500
Group III
Period 6
What is Thallium?
500
Solved the inconsistency between element and their atomic mass
Who is Moseley?
500
States that during any physical or chemical change, the total quantity of energy remains constant
What is the law of conservation of energy?
500
Sir William Ramsay
Morris M. Travers
Who discovered xenon?
500
It's impossible to measure accurately the position and velocity of an electron at the same time