Science LEARNING ACTIVITY SHEET 2 L 21. Learning Area: Lesson No.: 2 Quarter: Date: Lesson Title/ Topic: Scientific Models in Focus: Atomic Models Through Time Name: Ashley M. Bicos Grade & Section: humility Activity No. 2: Crossword Puzzle: Atomic Models in Focus (15 minutes) Objective(s): 1. Demonstrate understanding of scientific models and their importance in understanding atomic structure. 2. Summarize key concepts and historical evolution of atomic models. III. Materials Needed: 1. Pen/Pencil 2. Worksheet IV. Instructions: 1. The crossword puzzle contains terms related to atoms and atomic models that they have learned about in previous lessons. Fill in the puzzle with the correct terms based on the provided descriptions. 2. Pay attention to the number of letters in each word and the intersecting letters of the adjacent words to determine the correct answers. V. Synthesis Create a cloud concept map summarizing atomic models, using key terms relationships learned in previous lessons. Sample map is found below. Across: 4. Atomic model where electrons don't move around the nucleus in orbits. Electrons exist in specific energy levels as a cloud 8. Electrons reside in orbits. They move between each shell when gaining or losing energy. 9. Negatively charged particles 10. Building block of matter that cannot be broken apart using any chemical means Down: 1. An atom is made out of a sphere of positive charges with negatively charged electron embedded in it. 2. Subatomic particle with a neutral charge 3. A tangible model. 4. Matter is made of small indivisible atoms. 5. Most of the mass is concentrated in the center of atom. This tiny, dense, positively charged core called a nucleus. 6. Positively charged particles CONCEPT MAP
Answer (1)
Crossword Puzzle Answers for Lesson in AtomPlum Pudding Model – J.J. Thomson’s model where the atom is a positive sphere with embedded negative electrons, like raisins in a pudding.Neutron – A subatomic particle with no charge (neutral), found in the nucleus.Physical Model – A tangible or visible representation of something hard to observe directly (like atoms).Dalton’s Atomic Theory – Matter is made of indivisible atoms; atoms of the same element are identical.Rutherford Model – Discovered that atoms have a dense, positively charged nucleus with mostly empty space around it.Proton – A positively charged subatomic particle found in the nucleus.Quantum Mechanical Model – A modern atomic model where electrons do not follow set paths. Instead, they are found in cloud-like regions called orbitals.Bohr Model – A model by Niels Bohr that shows electrons moving in circular orbits (energy levels) around the nucleus.Electron – A negatively charged subatomic particle found in all atoms.Atom – The basic building block of matter. It’s the smallest unit of an element that still keeps its properties.Concept Map for the Atomical Model[tex]\[\begin{array}{c}\boxed{\text{Dalton Model}} \\[0.5em]\downarrow \\[0.2em]\text{(Atoms are solid spheres)} \\[0.5em]\downarrow \\[0.2em]\boxed{\text{Thomson Model}} \\[0.5em]\text{(Electrons in positive sphere)} \\[0.5em]\end{array}\][/tex][tex]\[\begin{array}{c}\\\downarrow \\[0.2em]\boxed{\text{Rutherford Model}} \\[0.5em]\text{(Nucleus is dense, electrons orbit it)} \\[0.5em]\downarrow \\[0.2em]\boxed{\text{Bohr Model}} \\[0.5em]\text{(Electrons in fixed energy levels)} \\[0.5em]\downarrow \\[0.2em]\boxed{\text{Quantum Mechanical Model}} \\[0.5em]\text{(Electrons in cloud-like orbitals)}\end{array}\][/tex]This map shows how scientists improved atomic models based on experiments. Dalton - First to say matter is made of atoms.Thomson - Discovered electrons.Rutherford - Discovered nucleus through gold foil experiment.Bohr - Showed electrons move in orbits with specific energy.Quantum Model - Current model. Electrons don’t move in orbits, but in probability zones.
