What kind of metals are the Group 1 metals?
group 1 alkali metals
Which elements are the most chemically reactive?
alkaline earth metals
What kind of metals are the Group 2 metals?
rare earth metals
What is another name for the transition metals?
What is an ion with a negative charge called?
What is an ion with a positive charge called?
Definition: Half the distance between the nuclei of two atoms of the same element.
Definiton: The ability of an atom of an elemnt to attract electrons when the atom is in a compound
Definiton: When elements are arranged in order of increasing atomic number, there is a periodic repetition of their physcial and chemical properties.
Elements in the same GROUP share what kind of properties?
Elements in the same PERIOD share what kind of properties
Definition: An element that is solid at room temperature, a good conductor of heat and electricity, and generally is shiny; ductile and malleable
Definition: An element that is a poor conductor of heat and electricity
Definition: An element that has some characteristics of metals and some characteristics of nonmetals
Definition: one of the elements of Group 17 of the periodic table (fluorine, chlorine, bromine, iodine, and astatine); combines with most metals to form salts
Defintion: One of the elements of Group 18 of the periodic table (helium, neon, argon, krypton, xenon, and radon)
inner transition metals
What did early chemists sort elements by?
increasing atomic mass
How did Mendeleev arrange the elements on his periodic table?
increasing atomic number
How are elements sorted on the Modern Periodic Table?
How does atomic mass, size change from top to bottom? Left to Right?
transfer of electrons between atoms
What causes an ion to form?
How does electronegativity change from top to bottom? Left to Right?
What did Medeleev leave space in his periodic table for?
it was more accepted (because the predicted properties were correct)
What effect did the discovery of GALLIUM have on the acceptance of Mendeleev's periodic table?
periodic repetition of physical and chemical properties
What pattern is revealed when the elements are arranged by increasing atomic number?
conducts heat and electricity
solid at room temp (except Hg)
What are the 5 properties of a metal?
behavior depends on conditions
How is a metalloid different than a metal or nonmetal?
1A to 7A
Representative Elements include which 7 groups?
because it has a filled outer ring
Why are noble gases unreactive?