Atoms - Rathjen Science!

Atoms - Rathjen Science!

Atoms Atomic Structure Electrons negatively charged part of atom found in electron clouds Nucleus positively charged center Protons positively charged particles in the

nucleus Neutrons particles in the nucleus that have no charge; neutral Charge of protons and electrons are opposite but equal, so their charges cancel each other out. Atoms of different elements contain different numbers of

protons Atomic Number number of protons in an atom Ex: Carbon atomic number is 6 6 protons, 6 electrons Atomic Number Element Name 6 C

Carbon 12.0 Chemica l Symbol Atomic Mass or Mass Number Copy this chart in your notes. Use the periodic table to fill in the missing info. Element Name

Atomic Number Chemical Symbol Atomic Mass Hydroge n Fe 8 12.0 Aluminu Atomic Mass/Mass Number Total

number of protons and neutrons in an atom. Ex: Carbon mass number is 12, atomic number is 6. 12 6 = 6 There are six neutrons. Example Boron 1. Atomic Number is 5 Atomic Mass is 11 (10.81 rounds to 11) Protons = 5 Electrons = 5

Neutrons = 11-5 = 6 Group Lets draw the Boron atom: 5 protons 5 electrons

6 neutrons electro ns - - +++ N + + N NNN N - Nucleus protons and

neutrons - Quick Check! Draw a NITROGEN atom with the correct number of protons and neutrons in the nucleus and the correct number of electrons in the electron cloud. Quick Check! Draw a Fluorine atom with the correct number of protons, neutrons, and electrons. -

+ + + + + + + N+ + - - N NN N N N N N N - -

- Isotopes Isotopes are atoms of the same element that have different numbers of neutrons. Ex: Carbon (C) atoms Always have 6 protons Naturally occurring Isotopes of carbon

6 neutrons (most common) 7 neutrons 8 neutrons Mass of an Atom The mass is so small that scientists made up a new unit. Atomic Mass Unit (amu) 1 proton ~ 1 amu 1 neutron ~ 1 amu

1 electron ~ 0 -> the mass of electrons has very little effect on the atoms total mass Mass Number = # of Protons + # of Neutrons Ex: Carbon Mass Number = 6 protons + 8 neutrons

Mass Number = 14 Carbon-14 Carbon -13 Carbon-12 (most common) Ex2: How many protons, neutrons, and electrons are in Neon22? Atomic Number = 10 Protons = 10 Protons 10 + Neutrons = Mass Number + ______

= 22 Neutrons = 12 How many electrons are in this isotope? 10 Ex3: How many protons, neutrons, and electrons are in Nitrogen-15? Atomic Number = 7 Protons = 7 Electrons = 7 Neutrons = 8 Protons 7 + Neutrons = Mass Number +

Neutrons = 8 _______ = 15 Unstable or Radioactive Isotopes Some isotopes are unstable or radioactive atoms that spontaneously fall apart after a certain amount of time, giving off radiation. Radiation can damage or destroy living cells. Radioactive Isotopes Cobalt 60

Protons: 27 Neutrons: 33 Electrons: 27 Mass Number: 60

Use: irradiating food (kills bacteria) The more neutrons in an isotope, the more mass it has, the easier it is to break apart the more likely it is radioactive Half-life the time it takes an atom to decay Isotopes may also be written like this 3

He Helium-3 Na Sodium-23 23 Mass number Quick Check! What is the name of this isotope? (Draw a diagram of this isotope in your notebook.)

Proton s Neutro ns Electro ns Particle Accelerator (Atom Smasher) used to make synthetic (man made) atoms Ions Ions an atom that is no longer neutral because it has gained or lost electrons

Positive ions when electron(s) are lost -more protons than electrons Helium N + + N - Negative ions when electron(s) are added or gained -more electrons than protons Helium N

+ + N - - Ex1: Positive or Negative Ion? - N N +

+ + N - Positive ion Why? B/c there are more protons than electrons (more positive than negative charges) Which element? Lithium Li+ Ex2:

Negative Ion?- Positive or N N + + + + - N N

N + - Positive ion How many electrons were lost? 2 Which element? Boron B2+ - Ex3: Negative Ion?-

Positive or N N - N + + + - +

N N - + - Negative ion How many electrons were added? 1 Which element? Boron B-

Recently Viewed Presentations

  • Silent Languages - Los Angeles Mission College

    Silent Languages - Los Angeles Mission College

    Silent Languages Chapter 5 " " Sign Language FOR MANY YEARS PEOPLE DID NOT THINK SIGN LANGUAGE WAS A 'REAL' LANGUAGE THEY THOUGHT IT WAS RANDOM GESTURES THIS IDEA REFLECTS LINGUISTIC IDEOLOGY CALLED ORALITY THIS MEANS THAT PEOPLE TOOK FOR...
  • Pipelining - Cornell University

    Pipelining - Cornell University

    Pipelining is a powerful technique to mask latencies and increase throughput Logically, instructions execute one at a time Physically, instructions execute in parallel
  • Grammar Rules IV - Socorro Independent School District

    Grammar Rules IV - Socorro Independent School District

    Because precedes a descriptive explanation. The dean worked all summer because she wanted to admit as many qualified students as possible. 25. Avoid sentence fragments, sentence run-ons, and a series of choppy, short sentences Fragments I wish there were more...
  • ITU Workshop on Quality of Service and Quality

    ITU Workshop on Quality of Service and Quality

    Standards considered stable and mature . Minor optional enhancements continue even now. XG-PON. XG-PON: 10-Gigabit-capable passive optical networks. System defined in the Recommendation ITU-T G.987 series. Recommendation ITU-T G.987: Definitions, abbreviations and acronyms.
  • Coagulation Cases Mike Webb Division of Clinical Hameatology

    Coagulation Cases Mike Webb Division of Clinical Hameatology

    FBC normal with round macrocytes. PT is 18 sec (N=10-15) aPTT is 48 sec (N= 25 - 36) PT/PTT prolonged PTT = XII, XI, IX, VIII PT = VII Common = I,II,V,X Both PT and PTT prolonged?? Diagnosis Special Investigations...
  • Introduction to Reading and Understanding Poetry

    Introduction to Reading and Understanding Poetry

    Poetic expression is hard to define and even harder to label since in itself it can comprise so many styles, ideas, lengths and forms. In this class we will focus on these poetic aspects: Idea and Emotion Type and Form...
  • Watercolor Resist Painting Space  positive and negative space

    Watercolor Resist Painting Space positive and negative space

    When dry, rub off resist and touch up with Prismacolor colored pencils. Guided practice: Teacher will instruct students on how to edit a photograph using the picture toolbar in Microsoft Word. She will then review how to use a grid...
  • Brave New World - Winston-Salem/Forsyth County Schools

    Brave New World - Winston-Salem/Forsyth County Schools

    2540 AD; referred to in the novel as 632 years AF ("After Ford"), meaning 632 years after production of the first Model T car. Narration: Third-person omniscient. Point-of-View: Narrated in the third person from the point of view of Bernard...