The Periodic Table and Law Flashcards

Terms Definitions
d-block elements
the transition metals
transition metals
the group B elements
magnesium
What element has the electron configuration [Ne] 3s2?
alkaline earth metals
the group 2A elements
Moseley
used x-rays to measure number of protons; arranged elements by increasing proton number (atomic number)
ns2(n-1)d2
What is the electron configuration for group 4?
3
How many valence electrons does group 13 have?
ns2(n-1)d7
What is the electron configuration for group 9?
Metals- have a shiny or metallic luster, good conductors of heat and electricity
Alkali Metal
Group 1 elements (except Hydrogen) reactive and are usually compounds with other elements.
metals
elements that are generally shiny when smooth and clean, solid at room temperature, and good conductors of heat and electricity; malleable and ductile
metalliods
on the stairs; in between metals and nonmetals;solids: B, Si, Ge, Ar, At, Te
noble gas
group 18; nonreactive due to full valence shell
33 elements
How many elements were on LaVoisier's list?
Similar Properties- Elements in the same group have similar properties, rather than elements in the same period.
Helium and Hydrogen
Period
The horizontal row of elements in the modern periodic table.
ionization energy
the energy required to move an electron from a gaseous atom
representative element
groups of elements in the modern periodic table that are designated with an A (1A through 8A) and have a wide range of chemical and physical properties
atomic radius
increases as you move down the periodic table because of more energy levels; decreases as you move across the peridocis table because of an increasing positive charge
periodic table
an arrangement of the elements in the order of their atomic numbers so that elements with similar properties fall in the same column (group)
actinides and lanthanides
What groups make up the inner transition metals?
periodic law
the statement that there is a periodic repetition of chemical and physical properties of the elements when they are arranged by increasing atomic number
ion
an atom or bonded group of atoms with a positive or negative charge
using the relationship between elements, predicted the existence and properties of many unknown elements
Besides creating the Periodic Table, what else did Mendeleev do that was important for the elements?
atoms in the same group/column
have the similar chemical properties because they have the same number of valence electrons
Organization of the Periodic Table: Alkali Metals
group 1A (except hydrogen), more reactive than other Alkaline Earth Metals
La; metal
What element is [Xe] 5d1 6s2 and is it a metal, metalloid, or nonmetal?
Metalloid- an element that has some characteristics of metals and some characteristics of nonmetals
Boron, Sillicon, Arsenic, Tellurium, and Astatine
What important contribution did John Newlands make?
He proposed an organized scheme for the elements
halogens and noble gases
Name the main groups that are in the nonmetals.
Stair Step- Line separating the metals from the non metals.
Metalloids. B, Si, As, Te, At.
group - decreases as you move down
What is the group trend for electronegativity?
trend of atomic radii on the PT
decreases as you move across and increases as you move down
trend of ionic radii on the PT
the positive ions decrease as you move across and the large negative ions also decrease as you move across; it increases as you move down
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