The Guys Behind it All
Greek philosopher who thought everything was made of tiny particles
Who is Democritus?
Positively charged particle.
What is a proton?
Columns and rows on the periodic table are called _____ and _______
What are groups and periods?
Electrons in the outermost shell.
What are valence electrons?
Atom with same number of protons but different number of neutrons
What are isotopes?
Particle discovered by J.J. Thomson
What is the electron?
Electrons are ___________ charged.
What is negatively charged?
There are _______ groups and ________ periods on the periodic table
What is 18 and 7?
Electrons allowed in second energy level
What is eight?
When an atom loses or gains electrons it becomes a(an)
What are ions?
The structure that Rutherford discovered was in an atom after his gold foil experiment
What is the nucleus?
Protons and neutrons account for the atom's ________
What is mass?
Periods in the periodic table determine the number of _________
What are energy levels?
Diagram that shows electrons in respective energy levels
What are Bohr diagrams?
Indicates number of atoms of each element in a chemical formula
What is a subscript?
The name of the atomic model proposed by J.J. Thomson
What is the Plum Pudding model?
Region in the atom where electrons exist
Electron cloud
Most reactive non-metals are the _________ and are found in group ________
What are halogens and group 18 or 8A?
Protons determine ______ of element while valence electrons determine _______
What are identity and chemical reactivity?
Five indicators of chemical reactions are ______, ______, ______, ______, ________
What is production of light, production of gas, color change, change in temperature, formation of precipitate
Experiment performed by Ernest Rutherford.
What is the cathode ray experiment?
Latest accepted atomic model
What is electron cloud model?
Elements that are considered semiconductors.
What are metalloids?
Tendency of atoms to prefer to have eight electrons in the valence shell and will combine with other atoms to have a full valence shell
What is the Octet rule?
Name given to atom that las lost an electron
What is a cation?