🥼 • Lesson 2.5 : The Periodic Table (Chem) Flashcards
During this lesson, we will learn more about the arrangement of elements in the periodic table, the properties of different groups, the transition elements, and the noble gases.
How is the Periodic Table arranged?
The Periodic Table arranges elements in periods (rows) and groups (columns) by increasing proton number (atomic number).
What is the trend in metallic and non-metallic character across a period?
Across a period, elements shift from metallic to non-metallic character, as you move from left to right.
Why do elements in the same group have similar chemical properties?
Elements in the same group have similar chemical properties because they have the same electronic configuration in their outer shell.
What trends are observed in groups of the Periodic Table?
In a group, elements show similar chemical behavior and their physical properties, like melting/boiling points.
These change as you move down the group.
How does the melting point change in Group I alkali metals?
The melting point of Group I alkali metals decreases as you move down the group (from lithium to potassium).
How does the density change in Group I alkali metals?
The density of Group I alkali metals increases as you move down the group.
How does reactivity with water change in Group I alkali metals?
The reactivity of alkali metals with water increases as you move down the group (lithium < sodium < potassium).
How do halogens’ reactivity and density change down Group VII?
As you move down Group VII, reactivity decreases, while density increases.
What is the appearance of chlorine at room temperature and pressure (r.t.p.)?
Pale yellow-green gas
What is the appearance of bromine at room temperature and pressure (r.t.p.)?
Red-brown liquid
What is the appearance of Iodine at room temperature and pressure (r.t.p.)?
Grey-black solid
What happens during displacement reactions of halogens with other halide ions?
A more reactive halogen displaces a less reactive halogen from its compound.
What are the properties of transition metals?
Transition metals are metals that have high densities, high melting points, form coloured compounds, and often act as catalysts.
What are the Group VIII noble gases and why are they unreactive?
Noble gases are unreactive, monatomic gases because their electronic configurations have full outer shells, making them stable.
How does the electronic configuration of an element determine its position in the Periodic Table and its chemical properties?
The number of valence electrons tells us which group the element is in and affects how it reacts with other elements.
