4.2 The Structure of an Atom This 45-foot-tall steel sculpture is made of 10 tons of steel. If a proton had the same mass as the sculpture, then an electron.

Slides:



Advertisements
Similar presentations
Section 4–2: The Structure of an Atom
Advertisements

The Structure of the Atom
The Structure of an Atom
 Element – building block of matter  Atom – smallest unit of an element that contains all the properties of that element  117 known elements = 117.
The Structure of an Atom. Beams like the ones Thomson produced create the images on many television screens. When a beam sweeps across the screen, spots.
Properties of subatomic particles Protons Electrons Neutrons
Glencoe: Chapter 19 Section 1 “part 1” Pages
Structure of an Atom 4.2 Objectives Identify 3 subatomic particles and compare their properties Distinguish the atomic number of an element from the.
The Structure of the Atom
Subatomic Particles and Isotopes. Subatomic Particles Protons- Positively Charged Protons- Positively Charged Located in the nucleus Located in the nucleus.
DO NOW: Answer the following questions 1. What are the subatomic particles? 2. Where are each subatomic particle located? 3. What is the charge associated.
Chapter 4 - Part 2 Protons, neutrons and electrons are all subatomic particles. Protons are positive (+) charged particles found in the nucleus of an atom.
4.2 The Structure of an Atom. Atom is the smallest particle of an element. Atoms cannot be divided into anything smaller.
Atoms 8.5A The student is expected to describe the structure of atoms, including the masses, electrical charges, and locations, of protons and neutrons.
4.2 The Structure of an Atom NEW - Opener #1 TUES (8th grade standard) - Hint: see ch. 4.2 & 4.1 if needed What is an atom? 2. What are.
9/18/ The Structure of an Atom THE STRUCTURE OF AN ATOM  VOCABULARY:  proton  electron  neutron  OBJECTIVES:  Identify three subatomic.
The Atom Chapter 4.2. Atoms: Are the smallest unit of an element that maintains the properties of that element. All atoms have a diameter of
CHAPTER 4 ATOMIC STRUCTURE. Aristotle (Greek) Thought all substances were built from either fire, earth, air, water Thought that atoms of a liquid are.
Pretest 1. True or False: Compounds have fixed compositions TRUE!
This 45-foot-tall steel sculpture is made of 10 tons of steel
The Parts of an Atom.
Chp 4.2- Structure of the Atom
Chapter 4 Atomic Structure
Matter & The Atom. Matter  The term matter describes all of the physical substances around us  Anything that has mass and volume (takes up space) 
ATOMS Basic building blocks of all matter.
The three SUBATOMIC PARTICLES are
The Structure of the Atom. Subatomic particles Subatomic particles are particles that are smaller than an atom Rutherford had predicted three subatomic.
4.2 The Structure of an Atom This 45-foot-tall steel sculpture is made of 10 tons of steel. If a proton had the same mass as the sculpture, then an electron.
Matter Intro Chapter. Anything that has mass and volume. Matter.
Matter & Atoms Unit 2. Matter Matter – anything that has mass and takes up space. Matter is made up of MUCH smaller particles known as atoms. 1)
What Makes Up a Atom?. Atoms are the smallest unit of matter. Atoms are the smallest unit of matter. Atoms CANNOT be divided! Atoms CANNOT be divided!
Atom Review 1.What are the 3 subatomic particles? 2.What atom is the amu based on? 3. What is located in the nucleus of the atom? 4. What is the nuclear.
Section 2 The Structure of an Atom. Key Concepts What are three subatomic particles? What properties can be used to compare protons, electrons, and neutrons?
The Structure of an Atom Chapter 4.2. Warm-up: KWL Chart - ATOMS What I Know About Atoms What I Would Like to Learn About Atoms What I Have Learned About.
3-2 Radioactivity and the nucleus (10.2 pg )
Atomic Structure Review
D. Subatomic Particle & the Nuclear Atom 1.Nucleus contains positively charged protons and neutral neutrons VERY dense! If a nucleus were the size of the.
4.2 The Structure of an Atom This 45-foot-tall steel sculpture is made of 10 tons of steel. If a proton had the same mass as the sculpture, then an electron.
Journal #20 1. Who discovered the electron? 2. What did Rutherford discover?
Physical Science: Ch 4 Notes
Modified by M. Sparks Atomic Structure Atomic Mass/Number Ions/Charges of Molecules Isotopes/Perc ent Abundance
What part of an atom is the arrow pointing to? A. proton B. electron C. neutron D. shell E. nucleus.
WHAT IS CHEMISTRY? The study of the properties of matter and how matter changes.
Atomic Mass. Each element found on the periodic table of elements is given an atomic mass The atomic mass tells you the average mass of the atoms of an.
Parts of the Atom: Properties  Protons: –Positive charge –Located in nucleus –Mass = 1 amu (Atomic Mass Unit)  Neutrons –No charge (neutral) –Inside.
EQ: What are the two types of chemical bonds and what makes each one unique?
ELECTRONS. Review Electrons were discovered by ______________ Electrons have a ___________ charge Electrons are located…. Outside of the nucleus in an.
Nature of Matter. Matter Anything that takes up space Has mass You are made up of matter…and so is everything around you.
Atoms and Elements. Subatomic Particles Atom- Smallest particle of an element. Subatomic Particles- Atoms are composed of protons, neutrons, and electrons.
Question # 1 How do the physical properties of matter compare to the chemical properties of matter?
Answers (2) D (12) C (22) D (32) C (3) A (13) B (23) A (33) A (4) B (14) C (24) C (34) B (5) D (15) B (25) B (6) C (16) D (26) D (7) C (17) B (27) A (8)
Atoms, Elements, & Compounds. Elements Element --- any substance that can’t be broken down into simpler substances. Example of an element --- Oxygen,
Subatomic Particles Atoms are composed of three particles Protons Neutrons Electrons Particles can be distinguished by their charge, mass, and location.
Atomic Structure Review Which of the following is NOT true about electrons? a) They have a negative charge b) They are the heaviest subatomic particle.
{ Atom and Isotope Review Physical Science. An atom has 6 protons, 8 neutrons, and 6 electrons. What is the atomic mass?
Unit 3: Atomic Structure. Atomic Structure  element  matter that is composed of one type of atom  atom  the smallest particle of an element that still.
This 45-foot-tall steel sculpture is made of 10 tons of steel
Bell work – what is an atom?
The Structure of an Atom
This 45-foot-tall steel sculpture is made of 10 tons of steel
This 45-foot-tall steel sculpture is made of 10 tons of steel
This 45-foot-tall steel sculpture is made of 10 tons of steel
Structure of the Atom (Section 4.2)
9/21/15 ll ork Complete all Bell Work for the week on a sheet of paper. Turn it in by Friday!! 1: What happens when an electron moves from.
This 45-foot-tall steel sculpture is made of 10 tons of steel
This 45-foot-tall steel sculpture is made of 10 tons of steel
Properties of Subatomic Particles
The Structure of an Atom
Example Example 1: The atom of an element has a mass number of 214 and an atomic number of 82. a) How many protons and neutrons does it have? The number.
Presentation transcript:

4.2 The Structure of an Atom This 45-foot-tall steel sculpture is made of 10 tons of steel. If a proton had the same mass as the sculpture, then an electron would have a mass of about 5 kilograms.

4.2 The Structure of an Atom Protons Based on experiments with elements other than gold, Rutherford concluded that the amount of positive charge varies among elements. A proton is a positively charged subatomic particle that is found in the nucleus of an atom. Each proton is assigned a charge of 1+. Each nucleus must contain at least one proton. Properties of Subatomic Particles

4.2 The Structure of an Atom Electrons The particles that Thomson detected were later named electrons. An electron is a negatively charged subatomic particle that is found in the space outside the nucleus. Each electron has a charge of 1 . Properties of Subatomic Particles

4.2 The Structure of an Atom Neutrons In 1932, the English physicist James Chadwick carried out an experiment to show that neutrons exist. Chadwick concluded that the particles he produced were neutral because a charged object did not deflect their paths. A neutron is a neutral subatomic particle that is found in the nucleus of an atom. It has a mass almost exactly equal to that of a proton. Properties of Subatomic Particles

4.2 The Structure of an Atom Everything scientists know about subatomic particles is based on how the particles behave in experiments. Scientists still do not have an instrument that can show the inside of an atom. Comparing Subatomic Particles

4.2 The Structure of an Atom Here are some similarities and differences between protons, electrons, and neutrons. Protons and neutrons have almost the same mass. About 2000 electrons equal the mass of one proton. An electron has a charge that is equal in size to, but the opposite of, the charge of a proton. Neutrons have no charge. Protons and neutrons are found in the nucleus. Electrons are found in the space outside the nucleus. Comparing Subatomic Particles

4.2 The Structure of an Atom Atomic Number and Mass Number Each element has a different atomic number. A The atomic number of sulfur (S) is 16. B The atomic number of iron (Fe) is 26. C The atomic number of silver (Ag) is 47.

4.2 The Structure of an Atom Atomic Number and Mass Number Atoms are neutral, so each positive charge in an atom is balanced by a negative charge. That means the atomic number of an element also equals the number of electrons in an atom of that element. Hydrogen has an atomic number of 1, so a hydrogen atom has 1 electron. Sulfur has an atomic number of 16, so a sulfur atom has 16 electrons.

4.2 The Structure of an Atom Atomic Number and Mass Number Mass Number The mass number of an atom is the sum of the protons and neutrons in the nucleus of that atom. To find the number of neutrons in an atom, you need the mass number of the atom and its atomic number. The atomic number of aluminum is 13. An atom of aluminum that has a mass number of 27 has 13 protons and 14 neutrons

4.2 The Structure of an Atom What is the difference between two isotopes of the same element? Isotopes Isotopes of an element have the same atomic number but different mass numbers because they have different numbers of neutrons.

4.2 The Structure of an Atom Isotopes Isotopes are atoms of the same element that have different numbers of neutrons and different mass numbers. To distinguish one isotope from another, the isotopes are referred by their mass numbers. For example, oxygen has 3 isotopes: oxygen- 16, oxygen-17, and oxygen-18. All three oxygen isotopes can react with hydrogen to form water or combine with iron to form rust.

4.2 The Structure of an Atom Assessment Questions 1.In which way do isotopes of an element differ? a.number of electrons in the atom b.number of protons in the atom c.number of neutrons in the atom d.net charge of the atom

4.2 The Structure of an Atom Assessment Questions 1.In which way do isotopes of an element differ? a.number of electrons in the atom b.number of protons in the atom c.number of neutrons in the atom d.net charge of the atom ANS:C

4.2 The Structure of an Atom Assessment Questions 1.Of the three subatomic particles that form the atom, the one with the smallest mass is the neutron. True False

4.2 The Structure of an Atom Assessment Questions 1.Of the three subatomic particles that form the atom, the one with the smallest mass is the neutron. True False ANS:F, electron