Classification
Where are metals mainly found on the periodic table?
On the left side
What is another name for "groups"?
Families
How are periods displayed on the PT?
Left and right rows
How are elements on the period table arranged?
By atomic #
What is an element's mass number equal to?
The # of protons + neutrons in the atom
What is the one nonmetal NOT found on the right side?
Hydrogen
What does the group number tell you about an element?
How many valence e- it has
What does the period number tell you about an element?
The # of energy levels in the element's electron cloud
Which number on the PT is used to identify the element?
Atomic #
When drawing a Bohr model, which energy level should be filled first?
Level 1 (closest to the nucleus)
List the symbols for the elements classified as metalloids.
B, Si, Ge, As, Sb, Te
What is the group name that represents the most reactive metals?
Alkali metals (group 1)
How many electrons does the first energy level (in the electron cloud) hold?
2 e-
Which number on the PT tells you the number of protons in an atom of an element?
Atomic #
How many electrons does the energy level closest to the nucleus hold?
2 e-
What are 2 characteristics of metal elements?
Shiny lustrous solids
Good conductors of heat and electricity
Loosely held valence e-
What is the group name that represents the most reactive nonmetals?
Halogens (group 17)
How many electrons does the second energy level (in the electron cloud) hold?
8 e-
What information do all PTs tell you about an element?
Atomic #
Symbol
Name
Atomic mass
How do you know the number of neutrons in an atom?
The mass # - the atomic #
What are 2 characteristics of nonmetal elements?
Mostly gases
Poor conductors
Tightly held valence e-
What is the group name of the least reactive elements?
How many electrons does the third energy level (in the electron cloud) hold?
18 e-
If an atom is electrically neutral, how can you use the periodic table to determine the number of electrons it has?
Atomic # -- if the atom is neutral, then the # of protons will equal the # of electrons
What state of matter are most nonmetals in at room temperature and normal atmospheric pressure?
Gases