This question is incomplete because it is lacking the necessary answer options, which I have provided below:
A. Alkaline earth metal; alkali metal; transition metal.
B. Alkali metal; transition metal; alkaline earth metal.
C. Alkali metal; alkaline earth metal; transition metal.
D. Transition metal; alkaline earth metal; alkali metal
So, given your question, the list which has the classes of chemical elements in order from most reactive to least reactive is: C. Alkali metal; alkaline earth metal; transition metal.
A chemical property refers to the properties of a chemical element or compound (substance) that is observable and measurable during a chemical reaction.
Some examples of the chemical properties of a chemical element or compound (substance) are;
Chemical reactivity is a chemical property that determines how readily a chemical element bonds with other chemical elements, in order to form a new chemical compound (substance).
As a general rule, the ability of a chemical element to bond with other chemical elements is highly (largely) dependent on the number of valence electrons in the outermost shell of its atom.
Hence, chemical elements with fewer number of valence electrons are the most reactive while those with more valence electrons are least reactive.
- Alkali metals = 1 valence electrons.
- Alkaline earth metal = 2 valence electrons.
- Transition metal = 2 valence electrons.
From the above description, we can deduce that the classes of chemical elements in order from most reactive to least reactive is: Alkali metal, alkaline earth metal and transition metal.
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