The Periodic Table
a table of all the known elements in increasing atomic number and arranged in a manner that models the atomic structure of the elements
What is the periodic table?
the distance from the center of the atom's nucleus to the outermost electron
What is atomic radius?
soft, highly reactive metal; one valence electron
What is alkali metals?
helped formulate early variations of atomic theory; listed some elements in a too-complex system
Who is John Dalton?
potassium has a ___________ atomic radius than bromine
What is greater?
What is periodic law?
tends to decrease across a period and increase down a group
What is atomic radius?
highly reactive; two valence electrons
What is alkali-earth metals?
triads of elements with similar properties (the foundation for periodicity)
Who is Dobereiner?
neon has a ___________ ionization energy requirement than potassium
What is greater?
a column of the periodic table; includes elements that have similar properties because they have similar electron configurations.
What is a group (or family)?
the measure of attraction between the nucleus and the electrons
What is electronegativity?
element from the 'd' block of the periodic table (3-12); metal with 1-2 valence electrons.
What is transition metals?
responsible for the law of octaves
Who is John Newlands?
Which element has the greater first ionization energy, Li or Ne?
Ne
number of electrons/valence electrons
What is electron configuration?
increases across a period, decreases down a group
What is electronegativity?
elements from the 'f' block of the periodic table; lanthanoids and actinoids
What is inner transition metals?
revised the periodic table so well that he predicted then-unknown elements' place in the periodic table
Who is Dmitri Mendeleev?
Which element has the greater atomic radius, Li or Cs?
Cs
____________ is to distance as ____________ is to attraction
What is atomic radius and electronegativity?
nonmetals with 7 valence electrons; usually a gas or soft solid
What is halogens?
revised the periodic table again using the atomic number rather than atomic mass
Who is Henry Moseley?
this element is the most reactive as well as the most electronegative
What is fluorine?