4. Atoms and Elements

Which element is classified as a metalloid on the periodic table?

In Mendeleev’s original periodic table, what primary criterion did he use to arrange the elements?

Which of the following correctly describes the element potassium, K, based on its position in the periodic table?

How many horizontal rows (periods) are in the modern periodic table?

How many periods (horizontal rows) are on the modern periodic table?

How many periods (horizontal rows) are in the modern periodic table?

Which element is the most abundant in the Earth's crust by mass?

Where are the metalloids located on the periodic table?

Periodic Table: Classifications — How many periods (horizontal rows) are in the modern periodic table?

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

Which of the following elements is strongly magnetic (ferromagnetic) at room temperature?

Who is most commonly credited with creating the first widely recognized periodic table of elements based on recurring (periodic) properties?

Where are metalloids typically located on the periodic table?

In the modern periodic table, elements are arranged in order of increasing which property?

In terms of periodic table classifications, the majority of the elements in the periodic table are classified as what?