It is important to recognize which numbering system is being used and to be able to find the number of valence electrons in the main block elements regardless of which numbering system is being used. You will come across periodic tables with both numbering systems. In this numbering system, group 1A is group 1 group 2A is group 2 the halogens (7A) are group 17 and the noble gases (8A) are group 18.
![color coded periodic table families color coded periodic table families](http://image3.slideserve.com/6026903/families-on-the-periodic-table1-n.jpg)
The elements in this group are also gases at room temperature.Īn alternate numbering system numbers all of the \(s\), \(p\), and \(d\) block elements from 1-18. We will learn the reason for this later, when we discuss how compounds form. These elements also have similar properties to each other, the most significant property being that they are extremely unreactive, rarely forming compounds. Group 1 elements all have the electron in their outer shells. The elements in each vertical column or group have similar properties. This group contains very reactive nonmetal elements. The table is also arranged in vertical columns called groups or families and horizontal rows called periods. Group 7A (or 17) elements are also called halogens. It is important to recognize a couple of other important groups on the periodic table by their group name. Remember, Mendeleev arranged the table so that elements with the most similar properties were in the same group on the periodic table. The same pattern is true of other groups on the periodic table. Once again, because of their similarities in electron configurations, these elements have similar properties to each other. Group 2A is also called the alkaline earth metals. Although most metals tend to be very hard, these metals are actually soft and can be easily cut. Group 1A is also known as the alkali metals. Each card includes the element name, symbol, atomic number and atomic mass, and is color - coded by element type. Learn the Periodic Table with these printable periodic table of elements flash cards.There are 6 cards per page, ready to print and cut for use. Because of their similarities in their chemical properties, Mendeleev put these elements into the same group. Printable Periodic Table of Elements Flash Cards. The elements in 1A are all very reactive and form compounds in the same ratios with similar properties with other elements. This is what causes these elements to react in the same ways as the other members of the family.
![color coded periodic table families color coded periodic table families](https://i.pinimg.com/originals/73/c3/08/73c3087489dfeaffbe0ceb16f57dfd8c.png)
All of the 1A elements have one valence electron.
![color coded periodic table families color coded periodic table families](https://cdn.slidesharecdn.com/ss_thumbnails/periodic-table-families-130517111243-phpapp01-thumbnail-4.jpg)
A group is a vertical column of the periodic table. Remember that Mendeleev arranged the periodic table so that elements with the most similar properties were placed in the same group.