Isotopes and Atomic Mass: What does the mass on the periodic table mean? By Trish Loeblein http://phet.colorado.edu Learning Goals: Define “isotope” using.

Slides:

Advertisements

Similar presentations

Isotope Notation Isotope Notation uses a symbol to convey information about an isotope of a particular element. 23 Na 11.

Advertisements

4.3: HOW ATOMS DIFFER ATOMIC NUMBER

Average Atomic Mass & % Abundance

Atomic Structure Nucleus – contains protons and neutrons

Chapter 11B Notes Determining Isotope Masses. Intro What is the mass of an atom with 6 protons and 6 neutrons? 12 What is the mass of an atom with 6 protons.

Atomic Mass & Number Isotopes The Periodic Table.

 Atoms of the same element are NOT exactly similar  They may have different masses ◦ Vast majority of mass is from protons and neutrons  Element is.

Clicker Questions for Isotopes and Atomic Mass

Bellringer 10/01/12 How many protons, neutrons and electrons are in U-235 and Pu-244?

Ch. 3 - Atomic Structure II. Masses of Atoms (p.75-80) Mass Number

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

Chapter 18 Lesson 2 Masses of Atoms

Atomic Mass Notes 5 Chapter 17-2.

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

Unit 2 Review - Section 1 Atomic Structure and Mass.

Periodic Table Atomic number definition, etc.. Warm-up: In your notebooks, write today’s date, the following question, and the answer to the following.

How atoms differ. Mass Number The sum of the protons and neutrons BUT…Why is it not an even number??

Masses of Atoms Chapter 19-2 Pages

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

Isotopes and Atomic Mass: What does the mass on the periodic table mean? Learning Goals: 1.Define “isotope”

Isotopes and Ions. Fill in the following table: Symbol Atomic Mass Atomic Number # of protons # of neutrons # of electrons Na Na Ne Ne Hg Hg Zn Zn Al.

 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.

1. Proton 2. Neutron 3. Electron 1. Protons 2. Neutrons 3. Electrons.

Ch. 3 - Atomic Structure II. Masses of Atoms (p.75-80)  Mass Number  Isotopes  Relative Atomic Mass  Average Atomic Mass.

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.

Do Now: If a student’s grade is weighted per the table below, what would their grade be? WeightAverage Tests50%80 Classwork30%95 Homework20%85.

Isotopic Abundance SCH 3U. Atomic Mass The mass of an atom (protons, neutrons, electrons) Relative Atomic Mass: An element’s atomic mass relative to the.

Section 4.3 How atoms differ. Atomic Number Represents three things in a neutral atom: 1. What element it is 2. The number of protons in each atom 3.

Calculating Particles in a atom

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.

 Nucleus contains most of the mass of the atom ◦ Protons and neutrons are far more massive than electrons ◦ Mass of a proton or neutron is approximately.

Isotopes and Mass Number. Isotope Atoms of the same element with: Same number of protons BUT Different number of neutrons ELEMENT IS TO ISOTOPE AS DOG.

Note: When doing calculations never clear your calculator.

Calculating Particles for an ion. Representations from the Periodic Table Fe Iron Oxidation States Name Atomic Mass Atomic Number.

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.

Parts of the Atom: Properties  Protons: –Positive charge –Located in nucleus –Mass = 1 amu (Atomic Mass Unit)  Neutrons –No charge (neutral) –Inside.

Chapter 3 Isotopes Part II. Atoms Nucleus is center core. Nucleus is center core. Nucleus is made of Protons & Neutrons. Nucleus is made of Protons &

1Chemistry Chapter 4: How Atoms Differ: Atomic number = # p + AND e - (assume neutral atom for charge). Atomic number = # p + AND e - (assume neutral atom.

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

1 The Atom Atomic Number and Mass Number Isotopes.

Same Element Different Atom- Isotopes All atoms of a particular element are not exactly alike. Some elements have atoms with different masses (isotopes)

Lesson 24: Isotopes An element can be identified by the # of protons it has # of neutrons can vary Neutrons add to the mass of the atom, but do not change.

Daily Science Who discovered the electron and how did he discover it? What was his model called? What tells you the number of p + an element has? Write.

Calculating Atomic Mass

II. Masses of Atoms Mass Number

Average Atomic Mass In nature, most elements are a mixture of different isotopes The mass of a sample of an element is a weighted average of all the isotopes.

Calculating Average Atomic Mass

Calculating Average Mass

Warm-up: Complete the following table

Estimating the Mass Number:

A B 21085At Fe Mo 5827Co 3216S Pb4+ Symbol

ATOMIC STRUCTURE AND MASS QUIZ REVIEW

Ch Atomic Structure II. Masses of Atoms (p.30-31) Mass Number

Mass of Individual Atoms

Isotopes QUICK NOTES Carbon-14

4.2 Periodic Table Squares and Average Atomic Mass

How many protons, neutrons, and electrons does Hydrogen-2 have?

Isotopes Atoms with SAME number of PROTONS (atomic number) but DIFFERENT numbers of neutrons (i.e. mass number) 6 protons 6 neutrons 6 protons 7 neutrons.

1. What are these two atoms of carbon called?

Atomic Structure Nucleons Atomic Number

Isotopes and Atomic Mass: What does the mass on the periodic table mean? By Trish Loeblein Learning Goals: Define “isotope” using.

Atomic Math Calculations

Ch. 4 - Atomic Structure II. Masses of Atoms Ch.4 Mass Number Isotopes

1. What are these two atoms of carbon called?

Find the average of the following numbers…

Chapter 18 Lesson 2 Masses of Atoms

Chemistry Chapter 3 Section 3

Presentation transcript:

Isotopes and Atomic Mass: What does the mass on the periodic table mean? By Trish Loeblein http://phet.colorado.edu Learning Goals: Define “isotope” using mass number, atomic number, number of protons, neutrons and electrons Compare and contrast: element, atom, isotope Given the number of protons, neutrons and electrons, find the mass and name of an isotope Given the name of an element and the number of neutrons, find the mass of an isotope Give evidence to support or dispute: “In nature, the chance of finding one isotope of an element is the same for all elements.” Find the average atomic mass of an element given the abundance and mass of its isotopes

Pre-Lesson Discussion Calculate the average mass of the eggs in the container. Record the mass of each type of egg and the number of each. What is difference between the “Average Mass” and “Individual Mass”? Design a situation to make the mixture ____g The teacher will need to figure out reasonable average mass for challenge.

Post-Lesson Questions

What would this be? Carbon-12 Carbon-14 Oxygen-14 More than one of these B

Reason: The number of protons tells the name of the atom; the mass is given by the sum of protons and neutrons 6 protons +8 neutrons = 14 amu

Which would be isotopes? 1 & 2 1 & 3 2 & 3 none more than one combination 1 2 A 3

Reason: Isotopes have same number of protons (so the same name), but different number of neutrons 1 and 2 are isotopes 1 2 3

What would the approximate average mass of Hydrogen be? 6 amu 2 amu 1.5 amu 1 amu Answer is C : A. 6 amu is the total mass B. one of the isotopes C. see next slide for reasoning D. most common isotope and value on periodic table.

Reason: 3/6 gives 50% of each, so .5*2+.5*1=1.5 amu You may discuss the fact that the isotope mass is rounded to whole numbers, but the exact values are 2.01410 and 1.00783. You can show this by using the sim. Just drag one isotope into the box and the value will be displayed. Why are there more digits in the answer in the sim?

What would the approximate average mass of Argon be? a. Value on periodic table b. just the middle value c. 37.5 = (2*36+38+ 40)/4 or .5*36+.25*38+.25*40 40 amu B. 38 amu C. 37.5 amu

Reason: .5*36+.25*38+.25*40 =37.5

Discussion Questions: How would you know if this combination is likely to be found in some dirt? See next slide

“My Mixture” “Nature’s Mix” Reason: 10/14*14+4/14*15=14.285 On the periodic table, the mass of Nitrogen is given as 14.007, so this is not the most common mixture found in nature. “My Mixture” “Nature’s Mix” Students could use the sim to explain, but I want to emphasize use of the periodic table.