Isotopes Atoms of the same element with different mass numbers. Mass # Atomic # Nuclear symbol: Hyphen notation: carbon-12 Courtesy Christy Johannesson.

Slides:

Advertisements

Similar presentations

4.3: HOW ATOMS DIFFER ATOMIC NUMBER

Advertisements

Atomic Structure Nucleus – contains protons and neutrons

OF PROTONS, NEUTRONS AND ELECTRONS IN AN ATOM

Essential Question: How do atoms of the same element differ?

Average Atomic Mass.

C Isotopes Mass # Atomic # 12 6

 Protons, neutrons, electrons too  Make up the atoms all around you!

Atoms: The building blocks of Matter

Dalton was proved incorrect and his theory was modified

Subatomic Particles, Atomic Number and Atomic Mass

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

Atomic Structure The smallest part of an element is an ATOM

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

Atomic Structure I. Subatomic Particles.

Average Atomic Mass. carbon atom (12 amu) Measuring Atomic Mass Unit is the Atomic Mass Unit (amu) One twelfth the mass of a carbon-12 atom. Each isotope.

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

Virtually everything that is, is made up of atoms. Chapter 12, page 361 Balloon and sweeter animation.

Isotopes Atoms of the same element that different mass numbers

1.3 Understanding Atomic Mass. A Review: Subatomic particles Electron Proton Neutron NameSymbolCharge Relative mass Actual mass (g) e-e- p+p+ nono +1.

Topic #7. Dalton was wrong about all elements of the same type being identical Atoms of the same element can have different mass numbers. ISOTOPES.

Counting Atoms 3.3. Counting Atoms Very difficult to count Atomic Number – # of p + of each atom of that element Whole numbers Elements arranged by atomic.

Isotopes Dalton was wrong about all elements of the same type being identical Atoms of the same element can have different numbers of neutrons. Thus, different.

NOTES – 4.3: Atomic Number, Mass Number, Isotopes and Atomic Mass.

Isotopes and Ions.

& Average Atomic Mass  Atoms with the same number of protons (they are the same element) but different number of neutrons.

1.4 Isotopes, Radioisotopes, and Atomic Mass B3.1 explain the relationship between the atomic number and the mass number of an element, and the difference.

 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.

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

Chapter 4 “Atomic Structure”. “Animal Style” Atom.

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

C. Johannesson Atomic Structure. Structure of the Atom  Protons- Positively charged particles in the nucleus  Neutrons-neutrally charged particles in.

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

Average Atomic Mass. Relative Atomic Masses  Masses of atoms (in grams) are very small, so for convenience we use relative masses.  Carbon-12 is our.

I. Subatomic Particles (p ). ParticleSymbolLocationChargeRelative Mass (amu) Actual Mass (g) electron proton neutron e-e- p+p+ n0n0 Electron.

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.

Unit 3: Atomic Structure. A. Subatomic Particles Most of the atom’s mass (Mass Number) NUCLEUS ELECTRON CLOUD PROTONS NEUTRONS ELECTRONS POSITIVE CHARGE.

The Modern Model The modern atom is composed of two regions: 1. Electron cloud- Most of the volume of an atom and is the region where the electron can.

EQ: What are Isotopes and how can we use them to calculate average atomic mass?

Distinguishing among Atoms

Parts of the Atom … from Discovery to Reality. NUCLEUS PROTONS ✚ Positively charged particles Mass = 1 amu NEUTRONS No charge or neutral Mass = 1 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)

Dalton’s Atomic Theory (experiment based!)

SNC1D Isotopes.

ATOMIC STRUCTURE THE NUCLEUS: 1) THE PROTON:

II. Masses of Atoms Mass Number

Now you try! Helium – 4 Oxygen – 16 Magnesium – 26 Isotope

Calculating Average Mass

Atomic Structure Subatomic Particles C. Johannesson.

Subatomic Particles Masses of Atoms Mass Number Isotopes Ions

Distinguishing Among Atoms

Unit 4: The Atom, And Isotopes

Atomic Structure.

C Isotopes Mass # Atomic # 12 6

Isotopes and Ions Section 3-3 Continued.

The atom and Isotopes.

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

Average Atomic Mass.

C Isotopes Mass # Atomic # 12 6

Structure of an Atom.

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

Atoms and their structure

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.

Periodic table data and Isotopes

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

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

ARE ALL ATOMS OF THE SAME ELEMENT IDENTICAL?

Atomic Number and Mass Number

Presentation transcript:

Isotopes Atoms of the same element with different mass numbers. Mass # Atomic # Nuclear symbol: Hyphen notation: carbon-12 Courtesy Christy Johannesson

Isotopes Nucleus Electrons Nucleus Neutron Proton Carbon-12 Neutrons 6 Protons 6 Electrons6 Nucleus Electrons Carbon-14 Neutrons 8 Protons 6 Electrons Nucleus Neutron Proton

Isotopes Chlorine-37 –atomic #: –mass #: –# of protons: –# of electrons: –# of neutrons: Courtesy Christy Johannesson Cl 37 17

Average Atomic Mass weighted average of all isotopes on the Periodic Table round to 2 decimal places Avg. Atomic Mass Courtesy Christy Johannesson

Avg. Atomic Mass Average Atomic Mass EX: Calculate the avg. atomic mass of oxygen if its abundance in nature is 99.76% 16 O, 0.04% 17 O, and 0.20% 18 O amu Courtesy Christy Johannesson

Avg. Atomic Mass Average Atomic Mass EX: Find chlorine’s average atomic mass if approximately 8 of every 10 atoms are chlorine-35 and 2 are chlorine amu Courtesy Christy Johannesson

Isotopes Dalton was wrong. Atoms of the same element can have different numbers of neutrons different mass numbers called isotopes California WEB C-12 vs. C-14

Naming Isotopes Put the mass number after the name of the element carbon- 12 carbon -14 uranium-235 California WEB

Atomic Mass How heavy is an atom of oxygen? There are different kinds of oxygen atoms. More concerned with average atomic mass. Based on abundance of each element in nature. Don’t use grams because the numbers would be too small California WEB

Measuring Atomic Mass Unit is the Atomic Mass Unit (amu) One twelfth the mass of a carbon-12 atom. Each isotope has its own atomic mass we need the average from percent abundance. California WEB

Calculating averages You have five rocks, four with a mass of 50 g, and one with a mass of 60 g. What is the average mass of the rocks? Total mass = (4 x 50) + (1 x 60) = 260 g Average mass = (4 x 50) + (1 x 60) = 260 g 5 5 Average mass = 4 x x 60 = 260 g California WEB

Calculating averages Average mass = 4 x x 60 = 260 g Average mass =.8 x x 60 80% of the rocks were 50 grams 20% of the rocks were 60 grams Average = % as decimal x mass + % as decimal x mass + % as decimal x mass + California WEB

Isotopes Because of the existence of isotopes, the mass of a collection of atoms has an average value. Average mass = ATOMIC WEIGHT Boron is 20% B-10 and 80% B-11. That is, B-11 is 80 percent abundant on earth. For boron atomic weight = 0.20 (10 amu) (11 amu) = 10.8 amu

Atomic Mass Magnesium has three isotopes % magnesium 24 with a mass of amu, 10.00% magnesium 25 with a mass of amu, and the rest magnesium 26 with a mass of amu. What is the atomic mass of magnesium? If not told otherwise, the mass of the isotope is the mass number in amu. California WEB IsotopePercentAbundanceMass Mg Mg Mg amu

Atomic Mass Calculate the atomic mass of copper if copper has two isotopes. 69.1% has a mass of amu and the rest has a mass of amu. Cu IsotopePercentAbundanceMass Cu Cu

Given the average atomic mass of an element is amu and it has three isotopes (“A”, “B”, and “C”): isotope “A” has a mass of amu and is 87.14% abundant isotope “B” has a mass of amu and is 12.36% abundant Find the mass of isotope “C”. Show work for credit.