Ch5 Flashcards
played the lead role in developing the structure of the
modern periodic table; predicted the existence of several missing elements at the time of his work
Dimitri Mendeleev
formulated the concept of triad
Johann Döbereiner
devised the commonly used electronegativity scale
Linus Pauling
ordered the periodic table by atomic number
Henry Mosley
proposed that elemental properties varied in octaves
John Newland
exists when some measurable property repeats on a regular basis in a sequential list or time sequence.
Periodicity
Who created the periodic law
Dimitri Mendeleev
stated that the properties of elements vary with their atomic masses in a periodic way.
Periodic Law
Who revised the periodic law
Henry Mosley
What does the revised law state
the properties of elements vary with their atomic numbers in a periodic way.
vertical column of elements
Group or Family
Horizontal rows of elements
Period or series
solid, lustrous (shiny), malleable, and ductile, and they are good conductors of heat and electricity.
Metals
generally gases or soft, crumbly solids. Examples are oxygen, nitrogen, carbon, and sulfur
Nonmetals
They share properties of both metals and nonmetals. Examples are boron silicone and arsenic
metalloids