1
The table that Mendeleev created was called the what?
what is the periodic table
Neutral atoms contain equal numbers of
protons and electrons
Period number indicates
number of shells or energy levels
An ion is an atom that has
gained or lost electrons
The elements in the same group number have what?
The same number of valence electrons
Do cations have a positive or negative charge?
positive
All atoms want _____ valence electrons
8
What are the three major categories of the periodic table?
metals, nonmetals, metalloids
Elements that have close to 8 valence electrons are considered to be what?
most reactive
Do anions have a positive or negative charge?
negative
Do metals, metalloids, or nonmetals like to gain electrons?
nonmetals
Group 18 is called the
noble gases
Do metals, metalloids, or nonmetals like to give up electrons?
metals
What is the bottom row of the periodic table called?
actinide
What elements are really important because of the computer revolution?
metalloids
Columns going from top to bottom on the periodic table are called what?
groups
Atoms that gain electrons and become more negative are called what?
anions
What element does not belong to a family?
hydrogen
Rows going from left to right on the periodic table are called what?
Periods
Group 1 on the periodic table is called the what?
alkali metals
Elements that have full valence electron shells are considered to be what?
inert
This scientist organized the 63 known atoms into a table based off of their atomic mass
Dimitri Mendeleev
What law states that when elements are arranged by their atomic number that you should see chemical and physical properties repeating?
Periodic Law
Atoms that lose electrons and become more positive are called what?
cation
What scientist discovered the atomic number and rearranged the periodic table using the atomic number?
Henry Moseley