1.
alkali metals: any metal in Group 1A of the periodic table
2.
alkaline earth metals: any metal in Group 2A of the periodic table
3.
atomic number: In the modern periodic table, elements are arranged in order of increasing ____.
4.
Dobereiner: grouped elements into triads
5.
ductile, malleable, and shiny: metals tend to be _____, ______, and ______
6.
Groups 1A, 2A: s block contains...
7.
Groups 3A, 4A, 5A, 6A, 7A, 8A: p block contains... (expection of helium)
8.
halogens: a nonmetal in Group 7A of the periodic table
9.
highest occupied energy level: For many representative elements, its group number equals the number of electrons in the ______
10.
inner transition metal: an element in the lanthanide or actinide series
11.
inner transition metals: f block contains...
12.
Mendeleev: arranged the elements in his periodic table in order of increasing atomic mass
13.
metallic and nonmetallic: Across a period, the properties of elements become less ______ and more_____
14.
metalloid: an element that tends to have properties that are similar to those of metals and nonmetals
15.
metals: one of the class of elements that are good conductors of heat and electric current
16.
metals, nonmetals, and metalloids: The three classes of elements are ____, _____, and ____.
17.
Moseley: determined an atomic number for each known element
18.
noble gas: an element in Group 8A of the periodic table; the s and p sublevels of the highest occupied energy level are filled
19.
noble gases and representative elements and transition metals and inner transition metals: Elements can be sorted into _____, ______, ______, or ______ based on their electron configurations.
20.
nonmetals: an element that tends to be a poor conductor of heat and electric current; properties opposite to those of metals
21.
periodic law: When elements are arranged in order of increasing atomic number, there is a periodic repetition of their physical and chemical properties
22.
principal energy level: Each period corresponds to a ______.
23.
properties: Chemists used the _____ of elements to sort them into groups.
24.
representative element: an element in an "A" group in the periodic table; display wide range of physical and chemical properties
25.
s and d: In transition metals, the highest occupied _ sublevel and a nearby _ sublevel generally contain electrons.
26.
s and f: In inner transition metals, the highest occupied _ sublevel and nearby _ sublevel of its atoms generally contain electrons
27.
s and p: In the atoms of representative elements, the ___ and ___ sublevels in the highest occupied energy level are partially filled.
28.
symbols and names and atoms: The periodic table displays the _____ and _____ of the elements, along with information about the structure of their _____.
29.
transition metal: one of the Group B elements in which substituent groups are on the opposite sides of a double bond
30.
transition metals: d block contains...
