1.2 The Periodic Table

• Order the following elements by increasing atomic radius: Lithium (Li), Sodium (Na), Cesium (Cs)

  1️⃣ Lithium (Li)

  2️⃣ Sodium (Na)

  3️⃣ Cesium (Cs)
• Ionization energy decreases down a group.


  True
• Electron affinity increases across a period from left to right.

  True
• Match the group name with its properties:

  Alkali Metals ↔️ Highly reactive, form +1 ions

  Halogens ↔️ Highly reactive nonmetals, form -1 ions

  Noble Gases ↔️ Inert gases, stable due to full valence shells
• Atomic radius decreases across a period due to increased nuclear charge
• What is the Periodic Table arranged by?

  Atomic number and chemical properties
• The periods in the Periodic Table are arranged in horizontal rows
• Elements in the same group have similar chemical properties


  True
• The elements in the Periodic Table are arranged by increasing atomic number.
• What happens to the properties of elements as you move from left to right across a period?

  They change gradually
• Electron affinity decreases as you move down a group.
• Electron affinity increases across a period due to increasing nuclear charge


  True
• The Periodic Table is organized by atomic number
• The Periodic Table is structured into Periods and Groups
• Elements in the same group have similar chemical properties.


  True
• How are periods and groups numbered in the Periodic Table?

  1 to 7, 1 to 18
• What is the fundamental tool in chemistry that organizes elements by atomic number and chemical properties?

  The Periodic Table
• Match the numbering of the Periodic Table with its feature:

  Periods ↔️ Numbered 1 to 7

  Groups ↔️ Numbered 1 to 18 (IUPAC)
• Atomic radius increases from left to right across a period

  False
• As you move down a group, the atomic radius increases
• What happens to atomic radius as you move across a period from left to right?

  It decreases
• What is ionization energy defined as?

  Energy to remove an electron
• Ionization energy decreases as you move down a group.
• Ionization energy increases across a period due to increasing nuclear charge

  True
• What is electron affinity defined as?

  Energy released when an atom gains an electron
• Elements in the Periodic Table are arranged by increasing atomic number and grouped by similar chemical properties.


  True
• What information does the position of an element in the Periodic Table provide about its properties?

  Reactivity, melting point
• Ionization energy increases across a period due to increasing nuclear charge
• What is electron affinity a measure of?

  Ability to gain electrons
• Electron affinity decreases down a group because outermost electrons are farther from the nucleus
• Elements in the same period have the same number of electron shells.


  True
• Ionization energy increases across a period.

  True
• Order the elements in Period 3 from Sodium (Na) to Argon (Ar) by increasing electron affinity:

  1️⃣ Sodium (Na)

  2️⃣ Magnesium (Mg)

  3️⃣ Aluminum (Al)

  4️⃣ Silicon (Si)

  5️⃣ Phosphorus (P)

  6️⃣ Sulfur (S)

  7️⃣ Chlorine (Cl)
• Metals are shiny, malleable, and ductile.


  True
• Metals are good conductors of heat and electricity
• The Periodic Table organizes elements by increasing atomic number.


  True
• The position of an element in the Periodic Table provides information about its reactivity and properties
• Match the feature of the Periodic Table with its description:

  Periods ↔️ Horizontal rows

  Groups ↔️ Vertical columns
• Periods in the Periodic Table are numbered from 1 to 7
• Atomic radius increases across a period from left to right.

  False