Course outline
Module 1
Module 1: Introduction to Atoms
Introduction to Atoms
Knowledge check
Q1. What is the smallest unit of matter that retains the chemical properties of an element?
- A. Molecule
- B. Atom ✓
- C. Proton
- D. Neutron
Why: An atom is the smallest unit of matter that retains the chemical properties of an element.
Q2. Which subatomic particle has a positive charge?
- A. Electron
- B. Neutron
- C. Proton ✓
- D. Quark
Why: Protons are subatomic particles that have a positive charge.
Q3. What is the term for the central part of an atom where protons and neutrons are located?
- A. Electron cloud
- B. Orbit
- C. Nucleus ✓
- D. Shell
Why: The nucleus is the central part of an atom where protons and neutrons are located.
Q4. Which of the following is true about electrons?
- A. They are found in the nucleus.
- B. They have no charge.
- C. They are much lighter than protons. ✓
- D. They are the heaviest subatomic particles.
Why: Electrons are much lighter than protons and are found outside the nucleus.
Q5. What determines the identity of an element?
- A. The number of neutrons
- B. The number of electrons
- C. The number of protons ✓
- D. The number of shells
Why: The number of protons in an atom determines the identity of an element.
Module 2
Module 2: The Structure of the Atom
The Structure of the Atom
Knowledge check
Q1. What is the central part of an atom called?
- A. Electron cloud
- B. Nucleus ✓
- C. Orbit
- D. Shell
Why: The nucleus is the central part of an atom that contains protons and neutrons.
Q2. Which subatomic particle has a negative charge?
- A. Proton
- B. Neutron
- C. Electron ✓
- D. Quark
Why: Electrons are subatomic particles that carry a negative charge.
Q3. What determines the identity of an element?
- A. Number of neutrons
- B. Number of electrons
- C. Number of protons ✓
- D. Number of shells
Why: The number of protons in the nucleus determines the identity of an element.
Q4. Which of the following is not found in the nucleus of an atom?
- A. Proton
- B. Neutron
- C. Electron ✓
- D. Nucleon
Why: Electrons are not found in the nucleus; they orbit around it.
Q5. What is the approximate diameter of an atom?
- A. 1 meter
- B. 1 micrometer
- C. 1 nanometer ✓
- D. 1 picometer
Why: The diameter of an atom is typically on the order of 1 nanometer.
Module 3
Module 3: Atomic Number and Mass
Atomic Number and Mass
Knowledge check
Q1. What is the atomic number of an element equal to?
- A. The number of neutrons
- B. The number of protons ✓
- C. The number of electrons
- D. The number of isotopes
Why: The atomic number is defined as the number of protons in the nucleus of an atom.
Q2. Which subatomic particle has no charge?
- A. Proton
- B. Electron
- C. Neutron ✓
- D. Quark
Why: Neutrons are subatomic particles found in the nucleus that have no electrical charge.
Q3. What is the mass number of an atom?
- A. The number of protons
- B. The number of electrons
- C. The number of neutrons
- D. The sum of protons and neutrons ✓
Why: The mass number is the total number of protons and neutrons in the nucleus of an atom.
Q4. Which of the following is true about isotopes?
- A. They have the same number of protons but different numbers of neutrons ✓
- B. They have the same number of neutrons but different numbers of protons
- C. They have the same number of electrons but different numbers of protons
- D. They have the same number of protons and neutrons
Why: Isotopes of an element have the same number of protons but different numbers of neutrons, resulting in different mass numbers.
Q5. What determines the identity of an element?
- A. The number of neutrons
- B. The number of protons ✓
- C. The number of electrons
- D. The number of isotopes
Why: The number of protons in the nucleus determines the identity of an element.
Module 4
Module 4: Isotopes and Ions
Isotopes and Ions
Knowledge check
Q1. What are isotopes?
- A. Atoms of the same element with different numbers of protons
- B. Atoms of the same element with different numbers of neutrons ✓
- C. Atoms of different elements with the same number of neutrons
- D. Atoms of different elements with the same number of protons
Why: Isotopes are atoms of the same element that have the same number of protons but different numbers of neutrons
Q2. Which of the following is true about ions?
- A. They have an equal number of protons and electrons
- B. They have a charge due to gaining or losing electrons ✓
- C. They are neutral particles
- D. They are formed by changing the number of protons
Why: Ions are formed when atoms gain or lose electrons, resulting in a charge
Q3. Which subatomic particle determines the identity of an element?
- A. Neutron
- B. Proton ✓
- C. Electron
- D. Quark
Why: The number of protons in an atom determines the identity of the element
Q4. What is the charge of a sodium ion (Na⁺)?
- A. -1
- B. +1 ✓
- C. +2
- D. -2
Why: A sodium ion has a +1 charge because it loses one electron
Q5. Which of the following is an isotope of carbon?
- A. Carbon-12 ✓
- B. Oxygen-16
- C. Hydrogen-1
- D. Nitrogen-14
Why: Carbon-12 is an isotope of carbon, as it has 6 protons and 6 neutrons
Module 5
Module 5: The Periodic Table
The Periodic Table
Knowledge check
Q1. What is the primary basis for the organization of elements in the periodic table?
- A. Atomic mass
- B. Atomic number ✓
- C. Electron configuration
- D. Reactivity
Why: The periodic table is organized based on atomic number, which is the number of protons in an atom's nucleus.
Q2. Which element has the atomic number 1?
- A. Hydrogen ✓
- B. Helium
- C. Lithium
- D. Beryllium
Why: Hydrogen is the first element on the periodic table and has an atomic number of 1.
Q3. What is the name of the horizontal rows in the periodic table?
- A. Groups
- B. Periods ✓
- C. Blocks
- D. Families
Why: The horizontal rows in the periodic table are called periods.
Q4. Which of the following is a noble gas?
- A. Oxygen
- B. Carbon
- C. Neon ✓
- D. Sodium
Why: Noble gases are found in group 18 of the periodic table, and neon is one of them.
Q5. Which group of elements is known for having a full outer shell of electrons?
- A. Alkali metals
- B. Halogens
- C. Transition metals
- D. Noble gases ✓
Why: Noble gases have a full outer shell of electrons, making them chemically inert.
Module 6
Module 6: Chemical Elements and Their Properties
Chemical Elements and Their Properties
Knowledge check
Q1. Which of the following is a noble gas?
- A. Oxygen
- B. Neon ✓
- C. Chlorine
- D. Hydrogen
Why: Noble gases are elements in group 18 of the periodic table, and neon is one of them.
Q2. What is the chemical symbol for gold?
- A. Ag
- B. Au ✓
- C. Fe
- D. Cu
Why: The chemical symbol for gold is Au, derived from its Latin name 'Aurum'.
Q3. Which element has the atomic number 1?
- A. Helium
- B. Hydrogen ✓
- C. Oxygen
- D. Carbon
Why: Hydrogen is the first element on the periodic table and has an atomic number of 1.
Q4. Which of the following is a metal?
- A. Oxygen
- B. Carbon
- C. Sodium ✓
- D. Phosphorus
Why: Sodium is a metal, while the others are nonmetals.
Q5. What is the most abundant element in the Earth's crust?
- A. Oxygen ✓
- B. Silicon
- C. Aluminum
- D. Iron
Why: Oxygen is the most abundant element in the Earth's crust, making up about 46.6% by mass.
Module 7
Module 7: Elemental Reactions and Compounds
Elemental Reactions and Compounds
Knowledge check
Q1. What is the chemical symbol for sodium?
Why: The chemical symbol for sodium is Na, derived from its Latin name 'Natrium'.
Q2. Which of the following is a compound?
- A. O2
- B. H2O ✓
- C. He
- D. Ne
Why: H2O is a compound made up of hydrogen and oxygen atoms, while the others are elements.
Q3. What type of bond is formed between two nonmetals?
- A. Ionic
- B. Covalent ✓
- C. Metallic
- D. Hydrogen
Why: Covalent bonds are formed between two nonmetals by sharing electrons.
Q4. Which element has the atomic number 8?
- A. Oxygen ✓
- B. Carbon
- C. Neon
- D. Nitrogen
Why: Oxygen has an atomic number of 8, which corresponds to the number of protons in its nucleus.
Q5. What is the correct formula for carbon dioxide?
- A. CO
- B. CO2 ✓
- C. C2O
- D. C2O2
Why: Carbon dioxide is composed of one carbon atom and two oxygen atoms, giving it the formula CO2.