Flashcards in ch 2 Deck (33):
Who proposed the atomic theory?
Who discovered the electon?
Who measured the electron and measured their charge to mass ratio?
Who discovered the nuclear theory of the atom?
the atom is mainly empty space, with most of its mass concentrated in the nucleus and most of its volume occupied by very light electrons
Who discovered neutrons?
unstable nucleus of atoms
#neurons + #protons
atomic number (Z)
# of protons
atoms of an element with the same number of protons but different number of neutrons
positive ion, lost electron
negative ion, gained electron
how is the per table arranged?
rows of increasing mass and similar properties
in periodic table, the columns are called
in the periodic table, the rows are called
who arranged the periodic table?
good conductors of heat/electricity, malleability, ductility, shiny, tend to lose electrons
poor conductors of heat/electricity, can be found in any state, tend to gain electrons
some are semiconductors, mixed properties
predictable based on their position in the periodic table
transition elements/ metals
less predictable based on the periodic table
un-reactive, complete, stable filled p orbitals
alkaline earth metals
very reactive non-metals
more metallic in color..
more likely to lose electrons
" --ide ion"
atomic mass, g/mol
number of atoms in a specific element
1 mol of anything = 6.022 x 10^ 23