The task of metals Classifying Metals based on Activity
Predicting the Product the Main group Metal reactions

The task ofMetals

The main difference between metals is the ease v whichthey undergo benidormclubdeportivo.orgical reactions. The elements toward the bottomleft corner of the periodic table space the metals that room themost active in the sense of being the most reactive.Lithium, sodium, and potassium all react through water, because that example.The rate of this reaction increases as us go down this column,however, since these aspects become more active together they becomemore metallic.

You are watching: Which element is the most reactive metal

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Classifying MetalsBased on Activity

The metals are often split into four classes on the basis oftheir activity, as shown in the table below.

Common Metals split into great on theBasis of their Activity


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

The most energetic metals space so reactive that they readilycombine with the O2 and also H2O vapor in theatmosphere and also are because of this stored under one inert liquid, suchas mineral oil. These metals are found exclusively in groups IAand IIA the the regular table.

Metals in the 2nd class room slightly less active. Theydon"t react with water at room temperature, but they reactrapidly with acids.

The third class includes metals such as chromium, iron, tin,and lead, i beg your pardon react only with strong acids. It additionally containseven less energetic metals such as copper, which only dissolves whentreated with acids that can oxidize the metal.

Metals in the fourth course are therefore unreactive castle areessentially inert in ~ room temperature. These steels are best formaking jewel or coins since they carry out not react through the vastmajority the the substances with which they come right into dailycontact. As a result, they are often called the "coinagemetals."

Predicting the Productof Main team Metal reaction

The product of plenty of reactions in between main group metals andother aspects can be predicted indigenous the electron configurationsof the elements.

Example: take into consideration the reaction in between sodium and also chlorine toform salt chloride. That takes more energy to eliminate an electronfrom a salt atom to form an Na+ ion than we get backwhen this electron is added to a chlorine atom to form a Cl-ion. As soon as these ions are formed, however, the force of attractionbetween these ion liberates enough energy to make the followingreaction exothermic.


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

The net result of this reaction is to transfer one electronfrom a neutral sodium atom come a neutral chlorine atom to form Na+and Cl- ions that have filled-shell configurations.

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Potassium and hydrogen have the complying with electronconfigurations.


K: 4s1 H: 1s1

When these facets react, one electron has to be transferredfrom one facet to the other. We have the right to decide which element shouldlose an electron by comparing the very first ionization energy forpotassium (418.8 kJ/mol) with that because that hydrogen (1312.0 kJ/mol).

Potassium is much more likely to shed anelectron in this reaction, which way that hydrogen gains anelectron to form K+ and also H- ions.

See more: When Does The Sign Flip In An Inequality, Rules For Operations On Inequalities

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Practice difficulty 1:

Write a balanced equation for the following reaction.

Li(s) + O2(s) " width="17" height="9" sgi_fullpath="/disk2/benidormclubdeportivo.orgistry/genbenidormclubdeportivo.org/public_html/topicreview/bp/ch9/graphics/rarrow.gif">