Atomic Theory
He said, "Matter is not made from earth, water, wind, and fire. It is made from atoms."
Who is Democritus?
Charge of an electron.
What is negative?
1s22s1
What is lithium?
Highly reactive. Has one valence electron. Loses one valence electron to gain a positive one charge.
What are the alkali metals?
"Size" of an atom. Increasing trend as you go down the periodic table.
What is atomic radius?
He was incorrect when he said that atoms were indivisible.
Who is Dalton?
Charge of a proton.
What is positive?
1s22s22p3
What is nitrogen?
Highly reactive. Has two valence electrons. Loses two valence electrons to gain a positive two charge.
What are the alkaline earth metals?
The degree to which an atom attracts electrons.
What is electronegativity?
He used the cathode ray tube to discover electrons. His model of the atom was called the plum pudding model.
Who is Thomson?
Add the protons and neutrons.
How do you calculate the mass number?
1s22s22p63s23p64s23d6
What is iron?
Highly reactive. Has seven valence electrons. gains one valence electron to gain a negative one charge.
What are the halogens?
The energy to remove an electron.
What is ionization energy?
He used alpha particles during the gold foil experiment to discover the nucleus of the atom.
Who is Rutherford?
Protons minus electrons.
How do you calculate the charge of an ion?
1s22s22p63s23p64s23d104p65s24d105p6
What is xenon?
Nonreactive elements that have a full valence shell.
What are the noble gases?
Contributes to lower ionization energy in larger atoms.
What is shielding?
He discovered that atoms have energy levels.
Who is Bohr?
The weighted average of all the isotopes of an element.
What is the atomic mass?
1s22s22p63s23p64s23d104p65s24d105p66s24f2
What is cerium?
Elements that have unpredictable number of valence electrons and charges.
What are the transition metals?
Contributes to lower electronegativity in larger atoms.
What is shielding?