The inner transition series elements are commonly designated as _________________?
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Answer: D. All
Explanation
Inner transition elements encompass both the lanthanide and actinide periodic series. These series fill their respective f orbitals deep within atomic structures. Historically they were grouped together and called rare earth metal elements. The periodic table places these two rows separately at the bottom. Lanthanides include elements from atomic number fifty-seven to seventy-one. Actinides consist of radioactive elements starting from atomic number eighty-nine.
Rare earth elements are critical components in modern electronics and magnets. Nuclear reactors utilize actinides like uranium for energy generation processes. Laser technology frequently incorporates doped lanthanide ions for optical amplification. Option A is incomplete because it only names the lanthanide series. Option B is incomplete because it only names the actinide series. Option C is incomplete because rare earth metals describe both series together.
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