Chemistry Fall semester

first step of the scientific

make an observation

A hypothesis must be

testable

data that involves numbers and measurements

quantitative data

dimensional analysis is used to

convert between units

the first atomic theory proposed by

John Dalton

Rutherford’s Gold foil experiment showed the atom is mostly

empty space

the atomic number equals the number of

protons

Isotope of the same element different in their number of

neutrons

a neutral atom has equal number of

protons and electrons

a cation is formed when an atom

loses electron

light behaves as both a

wave and particle

the highest energy type of radiation

gamma rays

as wavelength increases , frequency

decreases

the particle of light is called a

photon

the s-sublevel can hold

2 electrons

Atomic radius increases as you move

down a group

metals tend to

lose electrons

particle with no charge

neutron

outermost electrons that determine reactivity

valence electrons

positively charged particle

proton

negatively charged particle

electron

vertical column on the periodic table

group

the mass number

proton + neutron

the modern periodic table is arranged by increasing

atomic number

the speed of light is

3×10*8 m/s

the equation that relates wavelength and frequency

c=hv

a scientific theory is

a well supported explanation