Unit 1 Flashcards
alpha particle
2 protons; 2 neutrons
beta particle
high energy e-
positron
+ particle; same mass as e-
gamma ray
high energy electromagnetic radiation
periodic table: group 1
alkali
periodic table: group 2
alkali earth
metalloids (staircase)
B; Si; Ge; As; Sb; Te; Po
periodic table: group 17
halogens
periodic table: group 18
noble gases
elements 57-71
lanthanides
elements 89-103
actinides
inner transitional metals
lanthanides and actinides
groups 1-2 & 13-18
main group/representative
groups 3-12
transition metals
main group/representative
form cations (+ charge and share e-)
nonmetals
molecular compounds; form anions (take e-)
noble gases
neutral charge
transition metals
form cations
monoatomic ions
Na+; Cl-; Ca2+; O2-; N3+; N3-
millikan
oil drop experiment –> discovery of more e-
thomson
plum pudding –> + charge w/ equal - charge particles
rutherford
gold foil experiment –> discovers nucleus & deducts atoms mostly empty space and mass in center w/ nucleus
chadwick
neutrons
Rontgen
x-ray discovery