History
He is considered "the father of the Modern Periodic Table"
Dimitri Mendeleyev
Hown many groups are there?
18
They are shiny and good conductors of heat and electricity
Metals
It is as one-half the distance between the nuclei of identical atoms that are bonded together
Atomic radius
The energy required to remove one electron from a neutral atom of an element is the...
Ionization energy
The modern Periodic Table is arranged in order of increasing...
Atomic Number
How many periods are there?
7
They are usually dull and are not ductile or malleable
Nonmetals
It is an atom or group of bonded atoms that has a positive or negative charge
Ion
The energy change that occurs when a neutral atom gains an electron is called the atom’s
Electron affinity
Arranged the Periodic Table in order of increasing mass number
Dimitri Mendeleyev
How is the Group 1 called?
Alkali metals
Behave like metals or nonmetals under certain conditions
Metalloids
An atom that gains electrons becomes an...
Anion
It is a measure of the ability of an atom in a chemical compound to attract electrons from another atom of the compound.
Electronegativity
Arranged the Periodic Table in order of increasing atomic number
Henry Moseley
The "p" and "s" block elements are called
Main group elements
They are the most reactive nonmetals of the Periodic Table
Halogens
An atom that loses electrons becomes an...
Cation
Chemical element with the highest electronegativity
Fluorine
Presented a method for accurately measuring the relative masses of atoms
Stanislao Cannizzaro
It is a unique element, it does not belong to any family
Hydrogen
They are the most radioactive elements
Lanthanides
The electron in the outermost shell
Valence electrons
It is considered the most reactive metal in the Periodic Table
Francium