"Na" is Sodium.
A column is a chemical family, and they are split up into 18 families. An example would be column 1 which is the Alkali Metals and column 18 is the Noble Gases. A column also shares chemical properties with the elements in its group. A row is split up into groups of chemicals, and are ordered by the atomic number.
Whereas the vertical columns on the periodic table are called "groups", and represent the number of electrons in an element's outermost electron shell (eg. group 2 elements have twoelectrons in their farthest energy level), the horizontal rows, known as "periods", refer to the number of energy shells surrounding the nucleus of an element.
Ignore the placement of the periods, they are to space the models.Lines (\, /, |) represent bonds:O.....O.\\.../....N-...|....OO.....O..\..//....N-...|....OO.....O..\.../....N........OEach bond is distanced by a 120º angle.
the periods are the rows
IP Adress or internet Protocal Adress.. Hanz :)
Periods
They are called an octet.
Periods represent the number of shells in a particular element
Periods are types of elements.
Sorry but your question is an oxymoron as 'Old Britain' and 'Victorian times' represent two widely separated time periods.
They are put into periods based on their number of electron shells.
Usually, they represent periods between extinction events, where a particular type of lifeform was dominant.
There are decimal points in decimal numbers. They look just like periods.
comas
the hood
"Na" is Sodium.