Periodic table

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

• groups

• towers

• periods

• atomic numbers

The Modern Periodic Table of Elements is arranged by

• atomic mass
• atomic number
• valence electrons
• number of isotopes

Sodium (Na) is found in period 

• 3
• 2
• 4
• 1

What does the atomic mass tell you? 

• Basically,the number of electrons and protons
• The number of neutrons
• Basically, the number of protons and neutrons
• The number of protons.

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

What does the 1.00794 stand for?

• Hydrogen
• atomic number
• atomic mass
• atomic explosion

Choose all the items that are elements.

• NaCl (table salt)

• Sulfur

• O₂

• Water

• Air

Atomic Mass equals the combined number of

• Protons and Electrons

• Electrons and Neutrons

• Protons and Neutrons

Which two elements share common characteristics based on the periodic table?

• Sodium and Magnesium

• Chlorine and Sulfur

• Argon and Neon

• Calcium and Bromine