Untitled Presentation

Multiple Choice

Which of the following best describes the role of science in everyday life?

• It helps us understand the natural world and solve problems.

• It is only important for scientists and researchers.

• It is mainly about memorizing facts and formulas.

• It has no impact on our daily activities.

Open Ended

Explain how the electron structure of an atom determines its position on the periodic table. Use examples to support your answer.

Multiple Choice

Which statement best describes the role of the periodic table in determining the chemical properties of elements?

• It shows the atomic mass of each element.

• It organizes elements based on their electron structure and chemical properties.

• It lists only the names and symbols of elements.

• It provides the history of element discovery.

Multiple Select

Which of the following are considered subatomic particles found in an atom?

• Proton

• Neutron

• Electron

• Photon

Fill in the Blanks

The electrons in the outermost shell of an atom are called

electrons.

Multiple Choice

What does the analogy of a moving electric fan help illustrate about electrons in an atom?

• Electrons are stationary around the nucleus.

• Electrons move quickly and their exact position cannot be pinpointed.

• Electrons always follow a fixed path.

• Electrons are only found in pairs.

Open Ended

Describe how energy levels in an atom are similar to steps on a staircase or ladder. What does this analogy help you understand about electron arrangement?

Multiple Choice

Which principle explains why electrons fill orbitals of lower energy levels first?

• Aufbau principle

• Pauli exclusion principle

• Hund's rule

• Bohr model

Open Ended

Explain how the Bohr model helps in identifying the number of subatomic particles, group, and period number of an element.

Multiple Select

Which of the following statements about energy levels and sublevels are correct?

• Each energy level can have multiple sublevels such as s, p, d, f.

• The maximum number of electrons in the s sublevel is 2.

• Energy level 2 contains only the s sublevel.

• The d sublevel can hold up to 10 electrons.

Fill in the Blanks

The electron configuration of hydrogen is

Open Ended

Describe the relationship between the number of valence electrons and the electron configuration of an element using the Bohr model.

Multiple Choice

Given the electron configuration 1s2 2s2 2p1, how many energy levels are present in the atom?

• 1

• 2

• 3

• 4

Fill in the Blanks

The superscript 1 in the electron configuration 1s¹ refers to the only

of hydrogen.

Multiple Choice

Which of the following elements has 6 valence electrons based on their electron configuration?

• Carbon

• Oxygen

• Nitrogen

• Fluorine

Multiple Select

Select all statements that correctly describe the relationship between energy levels, electron configuration, and an element's position on the periodic table.

• Electrons occupy specific energy levels based on their energy.

• Elements in the same group have the same number of electrons and similar reactivity.

• Valence electrons can be represented with Lewis Dot Diagrams.

• All elements in a period have the same number of valence electrons.

Open Ended

How does the number of valence electrons change as you move across a period from left to right in the periodic table?

Multiple Choice

Who is the writer of the Lesson Exemplar for Science Grade 8, Quarter 2: Lesson 7 (Week 7)?

• Marisol T. Renon

• PNU-RITQ Development Team

• Philippine Normal University

• SiMERR National Research Centre

Open Ended

After studying this lesson exemplar in Science, what is one concept or topic you would like to explore further or have more questions about?