4. Atoms and Elements

Which of the following elements is classified as a metalloid on the periodic table?

What is the primary purpose of the periodic table in chemistry?

In general chemistry, who is most commonly credited with creating the first widely recognized periodic table (1869) by arranging elements according to recurring periodic properties?

Where on the periodic table are metalloids typically found?

Which major element is a primary component of human bones (mainly as calcium phosphate in hydroxyapatite)?

How is the periodic table primarily organized?

In the periodic table, the horizontal rows are called which of the following?

Periodic Table: Classifications — The majority of elements on the periodic table are classified as which type?

Periodic Table: Classifications — Who is credited with first publishing a periodic table that organized the elements into a repeating pattern of properties?

In the periodic table, what are the horizontal rows called?

Periodic Table: Classifications — Which element is the primary chemical basis of fossil fuels (coal, petroleum, and natural gas)?

How were the elements in Dmitri Mendeleev's first periodic table arranged?

How are metals primarily designated in the periodic table based on their location?

Which element has $26$ protons in its nucleus?

In the periodic table, the horizontal rows are called what?