Question

Main features of long form of periodic table

Answer 1

Hi there,
There are lot of features;;
The elements that have like physical and chemical properties are found in vertical columns;The vertical columns are called groups;The vertical columns are numbered from 1 to 8;Each number is followed by a letter: A or BA groups contain main elements and B groups contain transition elementsThe name of the horizontal row is period;The period that contains only H and He has the number 1.The properties of the elements divide the the periodic table in areas that are marked with different colors;The elements of the periodic table belong to 3 groups: metals, nonmetals, metalloids;Metalloids are located to the boundary between metals and nonmetals;The elements located to the left end of the period, have a metallic character;The properties of the elements from B (boron) to Te (tellurium) make difficult their classification (metals or nonmetals). 

Answer 2

Answer:

The main features of modern periodic table

Elements are arranged in the increasing order of atomic numbers.

Elements in the modern periodic table are arranged in 7 periods and 18 groups.

Horizontal rows are called periods and vertical columns are called groups.