1.7 The periodic table

• The periodic table is arranged by increasing atomic number.


  True
• Match the purpose with the organization of the periodic table:

  Classify elements by properties ↔️ Increasing atomic number

  Predict element behavior ↔️ Groups with similar properties
• How are elements arranged in the periodic table?

  By atomic number
• Ionization energy decreases down a group because outermost electrons are closer to the nucleus.

  False
• Who developed the periodic table in 1869?

  Dmitri Mendeleev
• Arrange the following groups in order of their increasing reactivity:

  1️⃣ Group 18 (Noble Gases)

  2️⃣ Group 17 (Halogens)

  3️⃣ Group 2 (Alkaline Earth Metals)

  4️⃣ Group 1 (Alkali Metals)
• What is the general characteristic of Group 1 elements?

  Highly reactive metals
• What are groups in the periodic table?

  Vertical columns
• What do elements in the same period share?

  Similar electronic configurations
• Arrange the trends in atomic properties across a period from left to right:

  1️⃣ Atomic radius decreases

  2️⃣ Ionization energy increases

  3️⃣ Electronegativity increases
• What is the key purpose of the periodic table?

  Understanding chemical relationships
• Match the group with its characteristic:

  Group 1 ↔️ Highly reactive metals

  Group 2 ↔️ Reactive metals

  Group 17 ↔️ Reactive nonmetals

  Group 18 ↔️ Inert gases
• Groups in the periodic table are numbered from 1 to 18
• Periods in the periodic table correspond to different energy levels of electrons
• Ionization energy increases across a period due to higher effective nuclear charge
• Match the property with its trend in the periodic table:

  Atomic Radius ↔️ Decreases across a period

  Ionization Energy ↔️ Increases across a period

  Electronegativity ↔️ Decreases down a group
• Which property of metals allows them to be drawn into wires?

  Ductility
• The p subshell can hold a maximum of 6 electrons.


  True
• Who developed the periodic table in 1869?

  Dmitri Mendeleev
• Periods in the periodic table are horizontal rows
• The periodic table is essential for understanding the behavior of matter at the atomic level.


  True
• Each period corresponds to a different energy level of electrons.


  True
• Which element has a larger atomic radius: Sodium (Na) or Chlorine (Cl)?

  Sodium (Na)
• The periodic table is arranged by increasing atomic number
• Elements in the same group share similar chemical properties due to the same number of valence electrons.

  True
• Noble gases in Group 18 do not typically react due to their stable electron configuration.


  True
• Ionization energy decreases down a group due to the outermost electrons being further from the nucleus.


  True
• Metals are malleable, meaning they can be hammered into thin sheets without breaking.


  True
• How many electrons can the first electron shell hold?

  2
• Which group of elements reacts vigorously with water?

  Alkali Metals
• How does atomic radius change across a period from left to right?

  Decreases
• Which element has a larger atomic radius: Sodium (Na) or Chlorine (Cl)?

  Sodium (Na)
• Metals have a shiny, lustrous appearance, while non-metals are typically dull
• Electron configuration is the arrangement of electrons within an atom's electron shells
• Elements in the same group share similar chemical properties because they have the same number of valence electrons