As a Matter of Fact
is the smallest particle into which an element can be divided and still be the same element
atom
who published an atomic theory in 1808?
John Dalton
the number of protons in the nucleus of an atom is the.....
atomic number
are elements that are shiny and conduct heat and electricity well
metals
each vertical column of elements on the periodic table
group
a Greek word meaning "not able to be divided"
atomos
who discovered the electrons?
J.J. Thomson
the total number of protons and neutrons in the atom's nucleus...
mass number
are poor conductors of heat and electricity
nonmetals
each horizontal row of elements on the periodic table
period
are the positively charged particles of an atom
proton
Ernest Rutherford
what is the mass number of a chlorine atom that contains 17 protons and 18 neutrons?
35
are elements that have some properties of metals ad some properties of nonmetals
metalloids
chemical bond
are the particles that have no electric charge
neutrons
who created this (show picture) model of the atom
Niels Bohr
periodic table
is the abbreviation for the element's name
chemical symbol
electrons found in the outermost energy level
valence electrons
the negatively charged particles of the atom
electrons
The current atomic theory suggests that electrons move within an area around the nucleus called....
electron cloud
What is the chemical symbol for aluminum?
Al
the weighted average of the masses of all the naturally occurring isotopes of an element
average atomic mass
the first energy level can hold how many electrons
2