Periodic Table (2/5/2025)

Vertical (up and down) columns in the periodic table are called _________ of elements and have similar properties. 

• groups

• periods

Who is credited with creating the first widely recognized periodic table?

• John Dalton

• Dmitri Mendeleev

• Henry Moseley

• Antoine Lavoisier

What is the main criterion for the arrangement of elements in the modern periodic table?

• Atomic mass

• Atomic number

• Density

• Melting point

Which of the following elements is a metalloid?

• Oxygen

• Silicon

• Iron

• Helium

In which period is the element with the atomic number 15 located?

• Period 2

• Period 3

• Period 4

• Period 5

Most elements on the left side of the periodic table are

• semiconductors

• metals

• nonmetals

• metalloids

Valence electrons are the

• outer most electrons in an atom

• total electrons in an atom

• inner most electrons in an atom

• All of the above

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which element is in period 3 and group 16?

• Phosphorus (P)

• Selenium (Se)

• Sulfur(S)

• Arsenic (As)

How many metalloids are in periodic table?

• 4

• 6

• 7

• 5

Which of the following is non metal?

• Fe

• Br

• Ge

• Al