Atoms & the Periodic Table Review

What is the atomic mass of Neon?

• 10

• 20.18

• 10.18

• 21

How many protons are in Beryllium?

• 4

• 9

• 5

• 2

How many electrons does a neutral atom of Iodine have?

• 53

• 126

• 73

• 179

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

Sodium (Na) is found in group 

• 1

• 2

• 3

• 4

What does 12.011 represent?

• atomic mass

• atomic number

• element name

• chemical symbol 

Horizontal rows of elements that share the same number of ENERGY LEVELS but DO NOT share chemical properties.

• Groups

• Periods

Vertical columns of elements that DO share chemical properties (react the same) because they have the same number of VALENCE ELECTRONS in their outer shells.

• Groups

• Periods