Periodic Table Concepts and Properties

This video explains the differences between periods and groups on the periodic table. Periods are horizontal rows where elements have the same number of electron shells, while groups are vertical columns where elements share similar chemical properties. The video also covers the numbering of groups, valence electrons, and exceptions among transition metals.

What is the periodic table primarily arranged by?

• Melting point

• Density

• Atomic number

• Atomic mass

How many horizontal rows, or periods, are there in the periodic table?

• 8

• 7

• 6

• 5

What do all elements in the same period have in common?

• Same atomic mass

• Same chemical properties

• Same number of electron shells

• Same number of protons

What are the vertical columns in the periodic table called?

• Rows

• Blocks

• Groups

• Periods

What do elements in the same group typically share?

• Same number of electron shells

• Same atomic mass

• Same atomic number

• Similar chemical properties

How are the groups numbered in the periodic table?

• 1 to 7

• 1 to 18

• 1 to 10

• 1 to 20

Which group naming method skips the transition metals?

• 1b to 8b

• 1 to 7

• 1a to 8a

• 1 to 18

How many valence electrons do elements in group 2a have?

• 4

• 3

• 1

• 2

Which element has 18 valence electrons?

• Helium

• Oxygen

• Lawrencium

• Palladium

What is the main difference between periods and groups?

• Periods have similar properties, groups do not

• Periods are horizontal, groups are vertical

• Periods are vertical, groups are horizontal

• Groups have the same number of electron shells