Review for CA2

Exploring the Periodic Table

A fascinating journey into the world of elements, their properties, and their organization. Discover the building blocks of matter and unlock the secrets of the chemical universe. Join us as we delve into the wonders of the periodic table.

Periodic Table

Group (column): 1-18

Period (row): 1-7

Multiple Choice

Which element is an alkali metal?

• Hydrogen

• Calcium

• Zinc

• Sodium

Elements are arranged in order of increasing atomic number

Properties

Multiple Choice

The properties of carbon are expected to be most similar to those of

• Phosphorus

• silicon

• boron

• aluminum

Exploring the Periodic Table

• Periodic Table: Arranged in order of increasing atomic number

• Group: Elements in the same group have same chemical properties

• Period: Elements arranged in rows from 1-7

• Bohr Diagram: Visual representation of an atom's electron arrangement

• Valence Electron: Electrons in the outermost energy level

• Lewis Dot Structure: Diagram showing valence electrons as dots around the element symbol

Multiple Choice

Which diagram shows the valence electrons as dots around the element symbol?

• Periodic Table

• Bohr Diagram

• Lewis Dot Structure

• Group

​Bohr model, description of the structure of atoms proposed in 1913 by the Danish physicist Niels Bohr.

​Bohr Diagram

Ink-Pair-Share

​Valence Electrons

Group Number: 1-18

Group (Number + Letter): 1A, 2A….: Valence Electrons

​Ink-Pair-Share

Lewis Dot Structure

Lewis Dot Structure is a diagram that shows the valence electrons as dots around the element symbol. It is a simple and visual way to represent the electron arrangement in an atom. By using Lewis Dot Structures, chemists can easily determine the number of valence electrons and predict the chemical behavior of elements.

Response Card

Draw the Lewis dot structure for the following elements:

Oxygen, Phosphorus, Calcium

Atomic Theories and Periodic Table

• Democritus and the Idea of the Atom: Democritus proposed the concept of the atom as the fundamental unit of matter. He believed atoms were eternal, homogeneous, and in constant motion.
• J.J. Thomson and the Discovery of the Electron: Thomson discovered the electron through his experiments with cathode rays.

Multiple Choice

Who proposed the concept of the atom as the fundamental unit of matter?

• Democritus

• J.J. Thomson

• Marie Curie

• Isaac Newton

Democritus and the Atom

Did you know? Democritus, an ancient Greek philosopher, proposed the concept of the atom as the fundamental unit of matter. He believed that atoms were indivisible and indestructible. This idea laid the foundation for modern atomic theory, revolutionizing our understanding of the physical world.

The Evolution of Atomic Models

1. J.J. Thomson's Plum Pudding Model: Proposed that electrons are embedded in a positively charged 'soup' of matter.
2. Ernest Rutherford's Gold Foil Experiment: Discovered the mostly empty space of the atom with a small, dense nucleus at its center.
3. Niels Bohr's Quantum Model: Introduced energy levels and revolutionized our understanding of atomic structure.

​Response Card

What similarities exist between the Bohr model and the structure of our solar system?

Multiple Choice

Which scientist proposed the Plum Pudding Model?

• J.J. Thomson

• Ernest Rutherford

• Niels Bohr

• Marie Curie

Multiple Choice

In a famous experiment conducted by Ernest Rutherford, positively charged alpha particles were scattered by a thin gold foil. Which of the following is a conclusion that resulted from this experiment?

• The nucleus is negatively charged

• The atom is a dense solid and is indivisible

• The mass is conserved when atoms react chemically

• The nucleus is very small and the atom is mostly empty space

Exploring the Periodic Table

Dmitri Mendeleev created the first periodic table in 1869. He organized elements based on atomic mass and chemical properties, leaving gaps for undiscovered elements. This method helps predict properties of undiscovered elements. Mendeleev's work laid the foundation for the modern periodic table.

Reorder

Reorder the following

• Democritus

• Dalton

• Thomson

• Rutherford

• Bohr

1

2

3

4

5

• 1
• 2
• 3
• 4
• 5

Multiple Choice

Who created the first periodic table in 1869?

• Dmitri Mendeleev

• Marie Curie

• Albert Einstein

• Isaac Newton

Dmitri Mendeleev

Dmitri Mendeleev created the first periodic table in 1869. His table organized the elements based on their atomic mass and predicted the existence of undiscovered elements (Physical and chemical properties). Mendeleev's periodic table laid the foundation for our understanding of the elements and their properties. It is considered one of the most significant achievements in the field of chemistry.

Multiple Choice

Which property did Mendeleev use to order his periodic table?

• Shielding effect

• Eletronegitivity

• Atomic Weight

• Metallic Character

​Response Card

After Mendeleev constructed the periodic table, he predicted the discovery of several elements that were not yet known. What prediction was Mendeleev able to make about these unknown elements, based on his table?

Quiz