The task of steels Classifying Metals based on Activity
Predicting the Product that Main team Metal reactions

The activity ofMetals

The major difference between metals is the ease v whichthey experience keolistravelservices.comical reactions. The facets toward the bottomleft corner of the periodic table are the steels that space themost active in the sense of gift the most reactive.Lithium, sodium, and potassium all react v water, for example.The price of this reaction boosts as we go down this column,however, due to the fact that these aspects become much more active together they becomemore metallic.

You are watching: What group contains the most reactive metals

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Classifying MetalsBased ~ above Activity

The metals are often divided into 4 classes ~ above the basis oftheir activity, as presented in the table below.

Common Metals divided into class on theBasis of your Activity


Class i Metals: The energetic Metals
Li, Na, K, Rb, Cs (Group IA)
Ca, Sr, Ba (Group IIA)
Class II Metals: The Less active Metals
Mg, Al, Zn, Mn
Class III Metals: The structure Metals
Cr, Fe, Sn, Pb, Cu
Class IV Metals: The Coinage Metals
Ag, Au, Pt, Hg

The most active metals room so reactive that they readilycombine through the O2 and also H2O vapor in theatmosphere and also are as such stored under one inert liquid, suchas mineral oil. These metals are uncovered exclusively in teams IAand IIA that the regular table.

Metals in the second class space slightly much less active. Theydon"t react through water at room temperature, yet they reactrapidly with acids.

The 3rd class includes metals such together chromium, iron, tin,and lead, i m sorry react just with solid acids. It additionally containseven less energetic metals such as copper, which only dissolves whentreated with acids that have the right to oxidize the metal.

Metals in the fourth course are so unreactive lock areessentially inert in ~ room temperature. These steels are right formaking jewelry or coins since they carry out not react with the vastmajority that the substances v which they come right into dailycontact. As a result, they are often dubbed the "coinagemetals."

Predicting the Productof Main team Metal reaction

The product of countless reactions between main team metals andother aspects can be predicted indigenous the electron configurationsof the elements.

Example: think about the reaction between sodium and also chlorine toform sodium chloride. That takes much more energy to remove an electronfrom a sodium atom to kind an Na+ ion 보다 we acquire backwhen this electron is included to a chlorine atom to form a Cl-ion. Once these ions space formed, however, the pressure of attractionbetween these ions liberates enough energy to do the followingreaction exothermic.


Na(s) + 1/2 Cl2(g) " width="17" height="9" sgi_fullpath="/disk2/keolistravelservices.comistry/genkeolistravelservices.com/public_html/topicreview/bp/ch9/graphics/rarrow.gif"> NaCl(s)
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Ho = -411.3 kJ/mol

The net effect of this reaction is to transport one electronfrom a neutral sodium atom to a neutral chlorine atom to kind Na+and Cl- ion that have actually filled-shell configurations.

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Potassium and hydrogen have actually the complying with electronconfigurations.


K: 4s1 H: 1s1

When these aspects react, an electron has to be transferredfrom one facet to the other. We deserve to decide which aspect shouldlose one electron by compare the first ionization power forpotassium (418.8 kJ/mol) with that for hydrogen (1312.0 kJ/mol).

Potassium is much much more likely to lose anelectron in this reaction, which method that hydrogen gains anelectron to type K+ and H- ions.

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Practice problem 1:

Write a balanced equation because that the adhering to reaction.

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