4. Atoms and Elements

Which element is considered the first in the series commonly referred to as the rare earth metals (lanthanides)?

How is the modern periodic table primarily arranged?

Which element is classified as a nonmetal and is a solid at standard temperature and pressure (STP)?

How are elements arranged in the modern periodic table?

Which element makes up most of Earth’s atmosphere (by volume)?

In developing the periodic table, Dmitri Mendeleev predicted the existence and properties of an undiscovered element he called eka-silicon. Which element was later discovered that matched this prediction?

How are the elements arranged in the modern periodic table?

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?