Periodic Table Concepts and Properties

What is the primary reason the Periodic Table is called "periodic"?

• Elements are arranged alphabetically.

• Elements show recurring properties.

• Elements are arranged by their atomic mass.

• Elements are grouped by their color.

How are elements organized in the Periodic Table?

• In periods and groups

• Randomly

• By their discovery date

• By their physical state at room temperature

What do the horizontal rows in the Periodic Table represent?

• Groups

• Periods

• Blocks

• Families

What do elements in the same period share in common?

• The same number of energy shells.

• The same number of valence electrons.

• Similar chemical reactivity.

• The same atomic mass.

How many energy shells does an element in the 6th period have?

• 3

• 4

• 5

• 6

Which element is in the first Group and has one energy shell?

• Lithium

• Helium

• Hydrogen

• Potassium

What do the vertical columns in the Periodic Table represent?

• Periods

• Groups

• Rows

• Series

What do elements in the same group have in common?

• The same number of energy shells.

• The same atomic number.

• The same number of valence electrons.

• Similar melting points.

What are the electrons in the outermost shell of an atom called?

• Core electrons

• Valence electrons

• Inner electrons

• Shell electrons

What property of an element is primarily determined by the number of valence electrons?

• Atomic mass

• Density

• Reactivity

• Boiling point