Atomic Mass Agenda Review (whiteboards) Read 4.7 & 4.8 Notes Homework.

Slides:

Advertisements

Similar presentations

Isotopes & Average Atomic Mass

Advertisements

Average Atomic Mass & % Abundance

Average Atomic Mass. How much does an atom weigh?  Protons & Neutrons:  1.67 X gram  Electrons:  9.10 X gram  To avoid working with.

Periodic table Groups – Columns down Alkali Metals Alkaline Earth Metals Halogens Noble gases Periods – Rows across Lanthanides Actinides Groups – Columns.

AIM: HOW TO CALCULATE THE AVERAGE ATOMIC MASS? DO NOW:1. WHAT ARE THE 3 SUBATOMIC PARTICLES OF AN ATOM? LIST THE THREE SUBATOMIC PARTICLES AND THEIR CHARGE.

What is average atomic mass?

Average Atomic Mass.

 Each element on the periodic table has an isotope.  What make an element have different isotopes?  There are 2 different isotopes of iron  Find the.

Average Atomic Mass. Average Atomic Mass – the weighted average of the masses of the isotopes of an element Every element is composed of several naturally.

Isotopes and Mass Number. Atomic Number The number of protons in each atom identifies it as an atom of a particular element Each atom has a unique number.

Atomic Mass. Isotopes Reminder Yesterday we learned that the mass of all atoms of a certain element are not always the same –Some atoms may have more.

Mass Number Atomic Number equals the # of... NUCLEUS ELECTRONS PROTONS NEUTRONS NEGATIVE CHARGE POSITIVE CHARGE NEUTRAL CHARGE ATOM.

Isotopes Atoms of the same element that different mass numbers

Atomic Mass Notes 5 Chapter 17-2.

Unit 3: Atomic Theory & Structure Section 2 – Distinguishing Among Atoms.

Number of Protons = Number of Electrons Number of Protons = Atomic Number Atomic Mass = Protons + Neutrons.

Average Atomic Mass The weighted average of the masses of all the naturally occurring isotopes of an element.

Element 44 = atomic # protons 44 electrons 66. How many protons and electrons are contained in an atom of element 44?

Variation in Atomic Structure: Isotopes and Ions Monday November 14 th and Tuesday November 15 th.

Average Atomic Mass.

Isotopes  Atoms with the same number of protons but different numbers of neutrons  Ex) Carbon 12 vs. Carbon 14  These atoms have a different mass 

More about isotopes Atomic mass vs average atomic mass or atomic weight.

 Atomic Number- the number of protons in the nucleus of an atom of that element  Ex: Hydrogen atoms have only one proton in the nucleus, so the atomic.

Chapter 4 Section 4.  There are about 118 known types of atoms.  Each element has it’s own type of atom.  All atoms of an element have to have one.

Using Isotope Data to Find a Weighted Average.  Each isotope will have two values associated with it.  Mass of Isotope  Percent Abundance (% found.

Isotopes and Average Atomic Mass Vocabulary: 1.isotope 2.percent abundance 3.average atomic mass “Marilyn Monroe”, Andy Warhol, 1962.

Section 4.3 How Atoms Differ. Objectives Explain the role of atomic number in determining the identity of an atom Define an isotope and explain why atomic.

…AND THE AVERAGE ATOMIC MASS Isotopes. PG 88 GENERAL- ATOMS OF THE SAME ELEMENT BUT HAVE DIFFERENT AMOUNTS OF NEUTRONS IN THE NUCLEUS PAGE 54 PRE AP ATOMS.

TAKE A …. GUIDED NOTES PAGE ATOMIC MASS W.S. ….OFF MY DESK.

Atomic Mass The Atomic Mass of Candium Lab. Atomic Mass This is the weighted average mass of the atoms in nature of that element A weighted avg mass reflects.

Atomic Mass. Masses in amu Only carbon-12 has an atomic mass exactly equal to its mass # One atomic mass unit (amu) is defined as 1/12 the mass of a carbon-12.

 The weighted average of its naturally occurring isotopes. Chemical Name Atomic # Chemical Symbol Atomic Mass (Average Atomic Mass)

Chapter 3 Average Atomic Mass. Section 3 Counting Atoms Relative Atomic Masses The standard used by scientists to compare units of atomic mass is the.

Average Atomic Mass How to use relative abundance to calculate average atomic mass.

Chapter 1 Activity 9 Part A

What is average atomic mass?

Isotopes. The Nucleus  The number of protons in the nucleus of an atom is unique to each type of element  BUT, the nuclei of the same type of element.

Average Atomic Mass What is average atomic mass? Average atomic mass is the weighted average of the atomic masses of the naturally occurring isotopes of.

How Atoms Differ. a. Properties of Subatomic Particles ParticleSymbolLocationRelative Charge Relative mass Actual mass (g) Electron Proton Neutron.

Atomic Mass. Atomic mass Most of the mass of an atom is in the nucleus. Most of the mass of an atom is in the nucleus. The nucleus is where all of the.

Atomic Mass Agenda Element Quiz Submit homework Read 4.7 & 4.8 Notes Homework.

Isotopic Abundance Pages Thinking question Why are there decimal places for atomic masses on the periodic table if protons and neutrons have amu.

WORKSHEET #36  Because some elements have different isotopes. This means the same atom has different numbers of neutrons.

Comparing Atomic Mass and Mass Numbers Atomic Mass Mass Number The mass number is the total amount of protons and neutrons in an atom. An atom of an element.

The Structure of the Atom The Building Block of Matter.

Atomic Mass Mrs. Cook. Atomic Mass - The average relative mass of all naturally occurring isotopes of an element. relative mass – The mass of one object.

Lab 9 The Atomic Mass of “Boltium” Purpose Calculate the atomic mass of “Boltium” Background The atomic mass of any element is a weighted average of all.

Aim: How to Calculate the Average Atomic Mass?

Atomic Mass Agenda Review (whiteboards) Read 4.7 & 4.8 Notes Homework.

How Atoms Differ.

ATOMIC STRUCTURE THE NUCLEUS: 1) THE PROTON:

Calculating Atomic Mass

Calculating Average Atomic Mass

Warm Up Monday 1/25/16 1. What are atoms?

What is average atomic mass?

What is average atomic mass?

66. How many protons and electrons are contained in an atom of element 44? element 44 = atomic # protons 44 electrons.

Unit 2: Atomic Theory & Structure

Isotopes and Average Atomic Mass

ISOTOPIC NOTATION isotopes are atoms with the same number of protons but different number of neutrons A Z X A = mass number (the total number of protons.

Distinguishing Between Atoms

Unit 2: Atomic Theory & Structure

Mass of Individual Atoms

Section 2.4 Atomic Weights.

AVERAGE ATOMIC MASS CALCULATIONS

Average Atomic Mass.

Aim: How to Calculate the Average Atomic Mass?

Chapter 18 Lesson 2 Masses of Atoms

Presentation transcript:

Atomic Mass Agenda Review (whiteboards) Read 4.7 & 4.8 Notes Homework

Parts of Atomic Theory

How do isotopes differ?

How do ions differ?

14 6 C ____ p + ____ e - ____ n o

9 4 Be +2 ____ p + ____ e - ____ n o

36 17 Cl - ____ p + ____ e - ____ n o

READ Grab book Read section 4.7 & 4.8 w/ partner Six inch voices

Average Atomic Mass date

Average atomic mass A WEIGHTED average dependent on the percent abundance of each isotope. If all isotopes were in a bag, how frequently would you pull out each separate isotope. Measured in amu’s

Atomic Mass Unit An amu is the mass of a single proton. 1 amu = 1.67* g

Determining Average Mass Multiply Mass number by Percent abundance. Add the answers. Answer should be close to most abundant isotope.

Example Cesium is 75% 133 Cs, 20% 132 Cs, 5% 134 Cs. What is the average atomic mass?

Example Chromium has four istopes. 4.35% 50 Cr, 83.79% 52 Cr, 9.5% 53 Cr, 2.36% 54 Cr. What is the average atomic mass of Cr?

Determining % abundance Create an equation equaling average atomic mass Mass 1 * %X + Mass2 * %Y = average atomic mass Create an equation equaling 100% X + Y = 1 Use substitution to solve for x. Mass 1 * %X + Mass2 * %(1-X) = average atomic mass

The average atomic weight of boron is amu. Boron has two isotopes: boron-10 with a mass of and boron-11 with a mass of What are the % abundances of each isotope?

What are the % abundances of the two isotopes of rubidium? Rb-85, amu Rb-87, amu

Homework Complete isotopes and average atomic mass worksheet Review scientists and discoveries. Lab report due Rough draft Wednesday Final draft Friday