The elements in a horizontal row of the Periodic Table
What is a period.
100
Radius of an atom
What is the Atomic Radius.
100
An atom or a group of atoms that carries an electric charge.
What is an Ion.
200
A vertical column in the periodic table; also called a family
What is a group.
200
A negative ion; an atom or goup of atoms that has gained one or more electrons
What is an Anion.
200
Any of the elements fluorine, chlorine, bromine, iodine, and astatine, occupying group VIIA of the periodic table
What are Halogens.
200
Across the PTOE Shielding is _____________.
What is Constant.
300
Group of eight valence electrons surrounding an atom. All noble gases have an octet of valence electrons, with the exception of helium
What is an octet.
300
Any of the highly reactive elements lithium, sodium, potassium, rubidium, cesium, and francium, occupying Group IA (1) of the periodic table of elements
What are Alkaline Metals.
300
the elements on the two rows which appear underneath the main body of the periodic table
What are the Inner Transition Metals.
300
The _____________ tends to decrease as one progresses across a period from left to right because the effective nuclear charge increases
What is the Atomic Radius.
400
A series of elements comprising Group 2 of the periodic table of elements
What is alkaline earth metals.
400
A positive ion; an atom or group of atoms that has lost one or more electrons.
What is a Cation
400
The minimum amount of energy required to remove the most loosely held electron of an isolated gaseous atom or ion.
What is Ionization Energy.
500
Outermost electrons of atoms; usually those involved in bonding
What is a Valence Electron.
500
A measure of the relative tendency of an atom to attract electrons to itself when chemically combined with another atom
What is Electronegativity.
500
The effective nuclear charge is the net positive charge experienced by an electron in a multi-electron atom.
What is Shielding Effect.
500
The development of the periodic table began with German chemist ______________ who grouped elements based on similarities.