Consider the structures of greenhouse gases, CO2 and CH4. Carbon dioxide has a very long lifetime in the air (centuries) versus methane that has a relatively short lifetime (decade). The lifetime of a molecule is also a reflection of the bonding and stability of the molecule. Discuss why you think these greenhouse gases have such different lifetimes in the atmosphere based on molecular structure, bond types, etc...

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Actinides

The elements in which the extra electron tends to enter the 5f-orbitals of (n–2)th main shell are considered 5f-block elements. They are also named actinides. Actinides include 15 elements, from atomic number 89 to 103.