2. Atoms & Elements

Which of the following actinides are found naturally on Earth?

Which two elements are the most abundant in Earth's crust?

Which of the following is NOT one of the eight most common elements in Earth's crust?

Which of the following lists correctly identifies the top three most abundant elements in Earth's continental crust?

How many inner shell electrons does an element in period 3 of the periodic table have?

Which of the following elements in period 3 of the periodic table is classified as a transition metal?

Which of the following elements is classified as a transition metal?

Where are the representative elements located on the periodic table?

Which of the following electron configurations represents a transition metal atom?

Classify each element as a representative element, transition metal, or inner‑transition metal.

Which of the following metals is the most abundant in Earth's crust?

Where are iron and aluminum typically located on the periodic table?

Which group of elements on the periodic table exhibits both metallic and nonmetallic physical and chemical properties?

Which of the following is the last element in period 4 of the periodic table?

Which of the following elements is located in period 4 of the periodic table?