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Unit 1: Structures, Trends, Chemical Reactions, Quantitative Chemistry and Analysis
1.2 The Periodic Table
1.2.1 Arrangement of elements
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Cards (45)
What is the atomic number of an element defined as?
Number of protons
What does the electron configuration of an atom describe?
Electron distribution
The period number in the Periodic Table corresponds to the highest occupied electron
shell
Atomic radius decreases from left to right across a
period
.
True
What are periodic trends driven by in the Periodic Table?
Increasing nuclear charge
What happens to ionization energy as you move down a group in the Periodic Table?
Decreases
What does the mass number of an atom represent?
Protons and neutrons
Steps to describe the arrangement of elements in the Periodic Table based on electron configurations:
1️⃣ Assign electron shells
2️⃣ Distribute electrons among shells
3️⃣ Identify valence electrons
Electron shells are numbered 1, 2, 3, and so on, moving further from the
nucleus
.
True
The period number in the Periodic Table corresponds to the highest occupied electron
shell
What are groups in the Periodic Table?
Vertical columns
Periods in the Periodic Table are arranged vertically.
False
Periodic trends are influenced by the number of protons and the arrangement of
electrons
.
True
Electronegativity increases down groups.
False
The Periodic Table classifies elements into three main categories: metals, nonmetals, and
metalloids
.
The atomic number determines an element's position in the
Periodic Table
.
True
What does the period number in the Periodic Table correspond to?
Highest occupied shell
Elements in the same group share the same number of valence
electrons
Periodic trends are driven by the increasing nuclear
charge
Electronegativity increases from left to right across a period.
True
The atomic number of an element is the number of protons in its nucleus.
True
Why is the atomic number unique to each element?
Number of protons
Valence electrons are located in the outermost
shell
How many electrons can the third electron shell hold?
18
Elements in the same group have the same number of
valence electrons
.
True
Elements in the same group share the same number of
valence
electrons in their outermost shell.
Match the feature with the corresponding term:
Horizontal rows ↔️ Periods
Vertical columns ↔️ Groups
As you move down a group, the atomic radius of elements
increases
because additional electron shells are added.
The atomic radius decreases as you move across a
period
.
True
Metalloids are located on the left side of the Periodic Table.
False
The atomic number is unique to each
element
Electron shells are numbered to represent different energy
levels
What does the group number in the Periodic Table indicate about an element?
Valence electrons
What happens to ionization energy as you move down a group?
Decreases
Atomic radius decreases from left to right across a
period
The increasing nuclear charge and decreasing shielding of valence electrons impact chemical
reactivity
The symbol for the atomic number is
Z
What do electron shells represent in an atom?
Energy levels
How many electrons can the first electron shell hold?
2
Match the period number with the shell occupied and the number of elements in that period:
Period 1 ↔️ Shell 1, 2 elements
Period 2 ↔️ Shell 2, 8 elements
Period 3 ↔️ Shell 3, 8 elements
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