Section 4.3 Modern Atomic Theory

Slides:

Advertisements

Similar presentations

Anyone who is not shocked by quantum mechanics has not understood it. —Neils Bohr (1885–1962)

Advertisements

Electron Configuration and Energy Levels: Ground state: All the electrons in an atom have the lowest possible energies Most stable electron configuration.

Modern Atomic Theory and Electrons Chapter 4 Section 3.

Modern Atomic Theory. Quick Review Dalton – Indivisible, solid spheres Thomson – Deflected Beam experiment – Plum Pudding Model (aka Chocolate Chip ice.

What produces the different colors in a fireworks display?

Rutherford’s model -Shows where protons & neutrons are -Not good at showing the location of electrons.

Bohr vs. Electron Cloud.

Modern Atomic Theory Chapter  Nucleus surrounded by a large volume of space  like Rutherford's model of 1911  Focused on the arrangement.

4-3 Cornell Bohr’s Model of the Atom Energy Levels

Section 2.2 Electrons in Atoms

Modern Atomic Theory Chapter 4.3 Notes.

What can happen when an atom absorbs energy?

4.2 The Structure of an Atom

Physical Science Chapter 4.

Bohr Model Starter: What do you picture when you think of an atom?

Emission Spectra Bohr Model of the Atom.

SCIENCE 9 MODELS OF THE ATOM. ALL ATOMS ARE NOT CREATED EQUAL Atoms can vary from one to the next of the same element in the number of neutrons they have.

CHAPTER 4 ATOMIC STRUCTURE. Aristotle (Greek) Thought all substances were built from either fire, earth, air, water Thought that atoms of a liquid are.

Chapter 4: Atomic Structure

Chapter 4 Atomic Structure.

Bohr-ing! Toward a Modern Atomic Theory LG: I can explain Bohr’s model of the atom and the experimental evidence to support this.

SUBATOMIC PARTICLES ParticleChargeMassLocation Proton+1 1 amu Nucleus Neutron0 Nucleus Electron 1/1836 or 0 amu Outside Nucleus.

Bohr's Model of the Atom.

Chapter. 5: Electrons in Atoms

Have you ever wondered what produces the different colors in a fireworks display? Certain compounds will produce certain colors of light when they are.

Bohr’s Model of the Atom

4.3 MODERN ATOMIC THEORY VOCABULARY: energy levels electron cloud

Modern Atomic Theory 4.3. Bohr’s model A. Concentrated on placement of electrons around the nucleus B. Looks like planets revolving around the sun.

Section 3 Modern Atomic Theory. Key Concepts What can happen to electrons when atoms gain or lose energy? What model do scientists use to describe how.

4.9 Bohr’s Theory of the Atom (Sec 7.2 pg 209). The last atomic model we learned about was Rutherford's. Rutherford's model proposed that electrons orbit.

4.3 Modern Atomic Theory What can happen to electrons when atoms gain or lose energy? Bohr’s Model of the Atom.

Studying Atoms. * How is it possible for us to study something we can’t see? * Need indirect evidence * Atoms are so small that even with the most powerful.

Chapter 5 Light Electrons in atoms. Models of the atom Rutherford’s model of the atom did not show or explain chemical properties of elements Needed some.

Electron Transition Can electrons move between energy levels? If so, how? How are transition and light related?

Electron Cloud Structure. Electron cloud structure In a neutral atom the # of electrons will equal the # of protons.

Physical Science: Ch 4 Notes

AtomsSection 3 Modern Models of the Atom 〉 What is the modern model of the atom? 〉 In the modern atomic model, electrons can be found only in certain energy.

Periodic Table Study Guide How to Draw Bohr Diagrams.

Historical Development of an Atom. Democritus B.C Democritus was a Greek philosopher ( B.C.) who is the father of modern atomic thought.

Each energy level is like a step on a stair. Electrons move up or down energy levels like going up or down stairs.

Lesson 3 : The Bohr Model. Bohr Model of an Atom  Electrons orbit the nucleus in fixed energy ranges called orbits (energy levels)  An electron can.

4.3 The Modern Atomic Theory. Have you ever wondered what produces the different colors in a fireworks display? Certain compounds will produce certain.

Energy Levels Each electron in an atom has a specific amount of energy. If an atom gains or loses energy, the energy of an electron can change.

Have you ever wondered what produces the different colors in a fireworks display? Certain compounds will produce certain colors of light when they are.

DRAWING ATOMIC MODELS.

Aim: How to distinguish an atom in the ground state and the excited state? The Bohr model of the atom was developed in the early part of the twentieth.

Quantum Warmup #1 1) What is the difference between an electron orbit as described by Bohr and orbital described by modern quantum theory? Answer: orbit.

Have you ever wondered what produces the different colors in a fireworks display? Certain compounds will produce certain colors of light when they are.

Unit 4 Atomic Structure.

Valence Electrons, Bohr Diagrams, & Light

Bohr's Model of the Atom.

0:56 0:55 0:54 0:53 0:57 0:58 1:02 1:01 1:00 0:59 0:52 0:51 0:44 0:43 0:42 0:41 0:45 0:46 0:50 0:49 0:48 0:47 1:03 1:04 1:19 1:18 1:17 1:16 1:20 1:21 1:25.

Bohr-Rutherford Diagram

Ch. 4/5 Notes Day 5 2/2/16.

Bohr's Model of the Atom.

Bohr’s Model of the Atom

Bohr's Model of the Atom.

Have you ever wondered what produces the different colors in a fireworks display? Certain compounds will produce certain colors of light when they are.

Key Concepts What can happen to electrons when atoms gain or lose energy? What models do scientists use to describe how electrons behave in atoms? What.

Have you ever wondered what produces the different colors in a fireworks display? Certain compounds will produce certain colors of light when they are.

Atomic Theory – Bohr & Chadwick

Have you ever wondered what produces the different colors in a fireworks display? Certain compounds will produce certain colors of light when they are.

Have you ever wondered what produces the different colors in a fireworks display? Certain compounds will produce certain colors of light when they are.

Bohr's Model of the Atom.

Give the symbol and number of protons in one atom of:

Modern Atomic Theory Chapter 4 Section 3.

Atomic Theory Part 2.

Aim: How are electrons arranged in an atom?

Presentation transcript:

Section 4.3 Modern Atomic Theory

Niels Bohr Agreed with Rutherford’s model of the atom. He agreed that there was a nucleus surrounded by a large volume of space. His model is often known as the planetary model because it resembled the solar system. His model went one step further than Rutherford’s model because it focused on the electrons. He stated that the electrons move with constant speed in fixed orbits around the nucleus.

He thought that electrons had a specific amount of energy. This possible energy an electron can have in an atom is called energy levels. Similar to the rungs on a ladder or steps on a staircase. As you go up the stairs you go to a higher energy level. An electron in an atom can move from one energy level to another when the atom gains or loses energy (Picture of model page 115).

Evidence of these energy levels is shown when the electrons give off the energy in the form of light (flame test lab and fireworks) Electrons are usually in their normal energy level called the ground state. When they absorb energy they move to a higher level called the excited state. When the electrons fall back to their ground state the energy is released in the form of light. Different elements emit different colors.

Drawing a Bohr Model NEUTRONS AND PROTONS: Neutrons and protons are located in the nucleus. Write the number of protons and neutrons inside the nucleus using the symbols ‘p+’ and ‘n0’.

ELECTRONS: Electrons are located in orbitals surrounding the nucleus. Number of electrons = Number of protons How many electrons can fit in each orbital? 1st orbital = 2 electrons 2nd orbital = 8 electrons 3rd orbital = 8 electrons 4th orbital = 18 electrons

The LOWER orbital MUST be full before you start filling the higher orbitals (ie the 1st orbital MUST have two electrons in it BEFORE you start filling the 2nd orbital)

Examples