Show:
Theory
Atoms
The Table
Table 2
Misc.
100
Who said same element, same atoms. Elements combine in specific proportions.
Dalton
100
dense, positively charged part of an atom
nucleus
100
These share similar properties on the periodic table (groups or periods)
groups
100
shiny, malleable, ductile, conductors
Metals
100
Said that electrons orbit the nucleus in energy levels or specific paths.
Bohr
200
Who conducted the gold foil experiment?
Rutherford
200
negative particle that orbits the nucleus
electron
200
Properties on the table change _____
across the periods
200
Group 1 on the table is known as the
alkali metals
200
Elements on the table are arranged by their __
atomic mass
300
Proposed the existence of atoms. Believed atoms were indivisible & that all things were made of atoms.
Democritus
300
In a neutral atom, the __ = __
protons = electrons
300
Mendeleev's table was useful because
left spaces for elements yet to be discovered
300
group of elements least likely to form a compound
Group 18, inert gases
300
This happened to the particles in the gold foil experiment.
Most went through, some bounced off
400
Rutherford discovered these 2 things
Nucleus & atoms are mostly empty space.
400
Atomic mass of an atom with 50 protons, 50 neutrons & 68 electrons
118
400
group 3-12, good conductors, less reactive than alkalis
Transition metals
400
Order the regions of the periodic table (left to right)
metals, metalloids, non-metals, inert gases
400
Properties of compounds are __ than the elements that form them.
different
500
In Thomson's model, the pudding represented the __ and the plums represented the __.
atom, electrons
500
current model of an atom. provide names of contributors & name of the model
Schroedinger & Heisenberg, Electron Cloud Model
500
shiny, brittle, solid @ room temp, semi-conductors
metalloids
500
4 things found in a box on the periodic table
atomic # atomic mass element name elemental symbol
500
poor conductors, not malleable or ductile
non-metals