History of the Atom
The first person to prose the idea that all matter was made of atoms.
Who was Democritus?
Positive charge located in the nucleus.
What is a proton?
The person who arranged the elements on the periodic table.
Who was Dmitri Mendeleev?
The equation for average atomic mass.
What is ((mass)(%)+(mass)(%))/100?
The person who brought back Democritus's concept of the atom.
Who was John Dalton?
Part of an atom with no mass.
What is an electron?
How the atoms are arranged on the periodic table.
What is the atomic mass?
How to write isotopes
What is the mass number followed by the symbol followed by the charge?
Discovered the electron.
Who was J.J. Thomson?
The number of protons plus the number of neutrons.
What is the atomic mass?
Three groups on the periodic table.
What are metals, non-metals, and metalloids?
The exception to the rule that metals are solid at room temperature.
What is mercury?
Discovered that electrons must be on energy levels.
Who was Niels Bohr?
Charged particles with an unequal number of protons and electrons.
What are ions?
Eighteen columns that share chemical properties.
What are groups?
Main group elements.
What are alkali metals, alkaline-earth metals, halogens, and noble gases?
Negative charges were distributed among the positively charged atom.
What was the plum pudding model?
Same elements with a different number of neutrons.
What are isotopes?
Semiconductors on the periodic table.
What are metalloids?
The two rows and the bottom of the periodic table.
What are lanthanides and actinides?