The Periodic Table of Elements 2023

The vertical (up and down) columns in the Periodic Table are called

• groups

• towers

• periods

• atomic numbers

Elements in a .................. have similar chemical properties.

• period

• group

• row

Which group of the periodic table is composed of inert (not reactive) gases?

answer choices

• alkali metals

• alkaline earth metals

• halogens

• noble gases

The horizontal row on the periodic table is called a

• group
• family
• period
• atomic number

What does the 1.00794 stand for?

• Hydrogen
• atomic number
• atomic mass
• atomic explosion

Mendeleev was the first person to arrange the elements into a table. How did he arrange the rows?

• alphabetical 
• density
• melting point
• atomic mass

Which of the following will have similar properties?

• O, S, Se

• O, F, Ne

• N, Ne, Na

• H, K, P

Moseley arranged what we know as the "modern periodic table". How did he arrange it?

• atomic mass

• atomic number

• valence electrons

• number of isotopes

Each column in the periodic table is called a _________ .

• period
• group
• cluster
• unit

Periods on the periodic table are __________.

• Horizontal Rows
• Vertical Columns