You are watching: The elements in group 2a are known by what name?
Some the these groups have unique names. The facets in team IA are dubbed the alkali metals.The facets in group IIA are called the alkaline earth metals.The aspects in team VIIA are referred to as the halogens and theelements in team VIIIA are called the noble gases or the inert gases.The steels in team IB (copper, silver and also gold) are sometimes dubbed thecoinage metals. The columnswith B (IB v VIIIB) are referred to as the transition elements.The columns v A (IA v VIIIA) are called the main groupelements.
The aspects can also be split into two main groups, the metals and thenon-metals. Metals are typicallyhave a metallic sheen (shiny) are malleable (bendable) and also conduct electricity.Nonmetals frequently do not show these properties.There space some facets that show some, yet not all, of the metallicproperties. These facets arecalled metalloids and also are labeled below are semi-conductors.
Electrons are the �glue� that hold atoms with each other in compounds.It is the outer shell electrons that kind these bonds betweenatoms. The an initial two quantum numbers n (the shell) and l (the subshell) space both necessary inunderstanding bonding. In thisclass we focus on the shell. Theshells exchange mail to the orbits the the Bohr model.(See class 10.3)
The first shell is the the smallest so it can only hold a best of 2 electrons.The 2nd shell can only host a best of 8 electrons.The third shell can only host a best of 18 electrons yet isparticularly secure at 8 electrons.
Because that is the outer shells that react, us are most interested in theouter shell electrons. We canrepresent the number of electrons in the outer shell v dots.The outer shell are given the surname valence electrons.Officially, the valence electrons space the electrons in the external shell ofthe uncharged atom. Chlorine has 7electrons in its outer shell and so deserve to represent it as a �Cl� through sevendots roughly it.
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Notice that for the main group elements, the number of valence electrons isequal to the group number.