Decide if the compound/ion listed can satisfy the octet rule (duet rule for h), if so choose satisfies octet ruleif the compound/ion cannot satisfy the octet rule for one of the atoms in the formula, choose one of the following three reasons why; too many valence electrons (more than eight), too few valence electrons (fewer than eight), or odd # of valence electrons. krcl2pcl5co3^2-no2no3-ocl2

b) mutualism

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answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

a electronegativity decreases beacuse the size of nucleus is bigger.