Question | Answer |
The two rows of elements at the very bottom of the periodic table are the [...] | The two rows of elements at the very bottom of the periodic table are the inner transition metals |
The top row of the inner transition metals is the [...] (it starts with lanthanum (La)) | The top row of the inner transition metals is the Lanthanides (it starts with lanthanum (La)) |
The bottom row of the inner transition metals is the [...] (it starts with actinide (Ac)) | The bottom row of the inner transition metals is the actinides (it starts with actinide (Ac)) |
The inner transition metals are sometimes referred to as the [...] metals. | The inner transition metals are sometimes referred to as the rare earth metals. |
One of the interesting things about the inner transition metals is that these elements are so [...] in properties that they are often hard to [...]. | One of the interesting things about the inner transition metals is that these elements are so similar in properties that they are often hard to tell apart. |
All elements of the [...] series are radioactive. | All elements of the actinide series are radioactive. |
Out of the 14 elements in the actinide series, only thorium and [...] occur in nature in any significant quantity. | Out of the 14 elements in the actinide series, only thorium and uranium occur in nature in any significant quantity. |
Most of the elements in the actinide series are [...] elements, which are not found on Earth unless produced in a laboratory. | Most of the elements in the actinide series are transuranium elements, which are not found on Earth unless produced in a laboratory. |
The heaviest naturally occurring element on Earth is [...]. (probably... there may be a few traces of larger elements out there). | The heaviest naturally occurring element on Earth is Uranium. (probably... there may be a few traces of larger elements out there). |
Actinide-series elements have nuclei that are so large that they tend to [...] (usually into a smaller nucleus). | Actinide-series elements have nuclei that are so large that they tend to break down or decay (usually into a smaller nucleus). |
As the actinide-series element nuclei decay, they emit [...]. This is called [...]active decay. | As the actinide-series element nuclei decay, they emit radiation. This is called radioactive decay. |
Interesting Factoid: Uranium has been used for nearly [...] years as an additive to ceramics. | Interesting Factoid: Uranium has been used for nearly 2,000 years as an additive to ceramics. |
If you want to find an element that's only made in a laboratory, just look past [...]. | If you want to find an element that's only made in a laboratory, just look past uranium. |
Uranium has an atomic number of 92, so any element with an atomic number greater than 92 is a [...] element. | Uranium has an atomic number of 92, so any element with an atomic number greater than 92 is a transuranium element. |
[...]-uranium just means 'beyond uranium'. | Trans-uranium just means 'beyond uranium'. |