1.2 The Periodic Table

• The atomic mass of an element is the sum of protons and neutrons in its nucleus.

  True
• The Periodic Table is divided into periods and groups based on atomic number, atomic mass, and chemical properties.

  True
• Metallic character decreases across periods but increases down groups.
• Ionization energy increases down groups in the Periodic Table.

  False
• Atomic size decreases down groups in the Periodic Table.

  False
• The Periodic Table is organized based solely on chemical properties.

  False
• Periods in the Periodic Table are arranged based on increasing atomic mass.

  False
• The atomic mass of an element is the total number of protons and neutrons
• Periodicity refers to the repeating trends in the properties of elements when arranged according to their atomic numbers
• Electronegativity increases across periods and decreases down groups
• Why does atomic size decrease across periods in the Periodic Table?

  Increasing nuclear charge
• What happens to metallic character as you move down a group in the Periodic Table?

  Increases
• Alkali metals have one valence electron, which they readily lose to form positive ions with a +1 charge.
• Alkaline earth metals react with air and water, but less vigorously than alkali metals
• What are the horizontal rows in the Periodic Table called?

  Periods
• What are the two main divisions of the Periodic Table called?

  Periods and groups
• Match the terms with their definitions:

  Periods ↔️ Horizontal rows in the Periodic Table

  Groups ↔️ Vertical columns in the Periodic Table
• Groups in the Periodic Table exhibit consistent chemical reactivity
• What is periodicity in the Periodic Table?

  Repeating trends in properties
• What happens to electronegativity as you move across a period from left to right?

  Increases
• Why does ionization energy decrease down groups in the Periodic Table?

  Electrons are farther from nucleus
• What are the vertical columns in the Periodic Table called?

  Groups
• Match the term with its definition in the Periodic Table.

  Periods ↔️ Horizontal rows

  Groups ↔️ Vertical columns

  Atomic Number ↔️ Number of protons

  Atomic Mass ↔️ Protons + neutrons
• Periods in the Periodic Table represent the filling of a new electron shell.


  True
• Metallic character increases across periods from left to right in the Periodic Table.

  False
• Understanding periodic trends is crucial for predicting element reactivity and compound formation.

  True
• Ionization energy decreases down groups because outer electrons are farther from the nucleus.


  True
• Periodic trends are essential for predicting the behavior of elements in chemical reactions.


  True
• Alkali metals are soft enough to be cut with a knife.


  True
• Match the halogen with its physical state and color:

  Fluorine ↔️ Gas, Pale yellow

  Chlorine ↔️ Gas, Yellow-green

  Bromine ↔️ Liquid, Red-brown

  Iodine ↔️ Solid, Dark purple
• Groups in the Periodic Table are arranged based on similar chemical properties
• What are the horizontal rows in the Periodic Table called?

  Periods
• Each period in the Periodic Table represents a new electron shell
• Ionization energy increases across periods and decreases down groups.
• What is the key property that makes alkali metals highly reactive?

  Single valence electron
• Halogens have seven valence electrons.

  True
• Each alkaline earth metal has two valence electrons
• Halogens exist as diatomic molecules
• The reactivity of halogens increases down the group due to increasing atomic size.

  False
• Noble gases exist as monatomic gases due to their stable electron configuration.


  True