11/17 A/B DayLEQ: How can neutrons and electronsaffect the characteristics of an atom?1. What is the difference between a convergent anddivergent boundary?2. What is the name of the process that causestectonic plates to move and shift?3. What is the law of superposition?4. What is a proton?5. What is an atom?
LET’S REVIEW… Atomic Number (# of protons 7 in theElement nucleus) Symbol N Nitrogen 14.01
How do we find the number of neutrons?
Today’s LEQ: How can neutrons andelectrons affect the characteristics of an atom?By the end of today, you should be able to…1. Model isotopes when given a specific atomic mass2. Model ions when given specific charge3. Tell the charge of a diagram of an atom
Make a hypothesis: Closest answer gets an emergency pass!When we change the number of protons in an atom,it becomes a different element.When we change the number of neutrons in an atom,I think_________________________.When we change the number of electrons in an atom,I think_________________________________.
Focus Vocabulary:66. Isotope67. Ion
ISOTOPEAtom with a different number of neutrons
Copy this in your notes… C-12ELEMENT ATOMICSYMBOL MASS
Elements of the same TYPE canhave DIFFERENTATOMIC MASSES
Carbon: What is the atomic mass? 12
Carbon: What is the atomic mass? 14
Normal Carbon Carbon ISOTOPE They have a different number of neutrons! 6 protons 6 protons 8 neutrons 6 neutrons (Atomic Mass = 14) (Atomic Mass = 12)
ISOTOPE Atom with a different number of neutronsC-12 = normal carbon atom (6 neutrons)C-14 = carbon ISOTOPE (8 neutrons)
Let’s model some isotopes!Neutrons Protons We are ONLY MODELING THE NUCLEUS NOW!!!
He-4 2Nucleus He Helium 4.00260
He-5 (isotope!) 2Nucleus He Helium 4.00260
Be-9 4 BeNucleus Beryllium 9.01218
Be-10 (isotope!) 4 BeNucleus Beryllium 9.01218
Be-11 (isotope!) 4 BeNucleus Beryllium 9.01218
O-16 8 ONucleus Oxygen 15.9994
Model: 0-14 Isotope
Model: Ne-22 Isotope
Model: Na-22 Isotope
Draw and label in your notebook….(nucleus only, but LEAVE ROOM FOR ELECTRONENERGY LEVELS! WE WILL ADD THESE LATER!)1. Li-7 REMEMBER:2. Li-5 (isotope)3. N-144. N-15 (isotope)5. F- 16 (isotope)6. Ne-207. Ne-21 (isotope)8. H-2 (isotope)
HOT Q:How is an isotope differentfrom just a regular atom? Whatabout the atom CHANGES? Hint:
THE MASS!!! Isotope withless neutrons (or weight!) Regular Atom Regular Atom Isotope with more neutrons
Isotopes and Absolute Dating: Reading1.What is one way that scientists use isotopes?2.What substance is found in all living things?3.Do you think that carbon dating is a good way to predict the age of something? (Is there anything you think might make this process inaccurate?)4.How do isotopes relate to our last unit of geologic evolution and earth history?
Summarizer: PART ONETake a look at your hypothesis from the beginning ofclass. It should look like this,When we change the number of neutrons in an atom, I think _______.1. Was your hypothesis correct? (Totally? Partially? Not at all?)2. What ACTUALLY happens when we add or subtract the number of neutrons in an atom? How do the characteristics of the atom change? (YOU MUST USE THE WORD ISOTOPE IN YOUR ANSWER!)
Today’s LEQ: How can neutrons andelectrons affect the characteristics of an atom? By the end of today, you should be able to… 1. Model isotopes when given a specific atomic mass 2. Model ions when given specific charge 3. Tell the charge of a diagram of an atom
IONAtom with a different number ofelectrons; has a + or — CHARGE
ION Atom with a different number of electronsN +1 = nitrogen that LOST one valenceelectronN -2 = nitrogen that GAINED two valenceelectrons