1 / 21

Atoms

Atoms. Atom. Smallest part of an element with all the properties of that element. 2 parts. 1. Nucleus. Center of atom most of atomic mass contains protons & neutrons. Nucleus. Mass Number. Mass # = Mass of the nucleus 1 proton = 1amu (atomic mass unit) 1 neutron = 1 amu

eldon
Télécharger la présentation

Atoms

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Atoms

  2. Atom • Smallest part of an element with all the properties of that element. • 2 parts

  3. 1. Nucleus • Center of atom • most of atomic mass • contains protons & neutrons Nucleus

  4. Mass Number • Mass # = Mass of the nucleus • 1 proton = 1amu (atomic mass unit) • 1 neutron = 1 amu • The average # protons + # neutrons • Electrons too small to contribute to mass 5 B Boron 10.81 Mass

  5. What is the mass (rounded to the nearest whole number) of an atom of each of these elements? • 11 • 23 • 22.99 • 22 • 24 • 51 • 51.99 • 52 • 36 • 83 • 83.80 • 84 Na = 23 Cr = 52 Kr = 84

  6. - - 2. Electron Cloud • Cloud of electrons that surrounds the nucleus • Individual electrons move so fast, they appear as a cloud • Most of the volume of the atom. • Mostly empty space. Electron Cloud

  7. 3 subatomic particles • Protons: positive charge (+) located in nucleus • Neutrons: neutral charge (=) located in nucleus • Electrons: negative charge (-) located in the electron cloud

  8. 5 B Boron 10.81 - - - - - = + + = = Atomic Number + = = = + + Protons • # protons (positive charges) = atomic # • Atoms of different elements have different numbers of protons.

  9. How many protons (+) are in the nucleus of an atom of each of these elements? • 11 • 23 • 22.99 • 22 • 24 • 51 • 51.99 • 52 • 36 • 83 • 83.80 • 84 Kr = 36+ Na = 11+ Cr = 24+

  10. Different elements have different numbers of protons (+). • Which atom has 8 protons? • Which atom has 6 protons? • Which atom has 7 protons? A. Carbon B. Nitrogen C. Oxygen D. Moccium Oxygen Carbon Nitrogen

  11. 5 B Boron 10.81 - - - - - = + + = = + = = = + + Neutrons • # neutrons (neutral, no charge) = mass – protons (atomic #) Atomic Number (# protons) 11 (rounded) -5 6 neutrons Mass (# protons + # neutrons

  12. How many neutrons (=) are in the nucleus of an atom of each of these elements? • 11 • 12 • 22.99 • 22 • 24 • 26 • 28 • 52 • 36 • 48 • 83.80 • 84 Na 23 -11 12 = Cr 52 -24 28 = Kr 84 -36 48 =

  13. 5 B Boron 10.81 - - - - - = + + = = Atomic Number + = = = + + Electrons • # electrons (negative) = # protons (atomic #) • # negative charges = # positive charges, the atom is neutrally charged (has no charge)

  14. How many electrons (-) are in the electron cloud of an atom of each of these elements? • 11 • 23 • 22.99 • 22 • 24 • 51 • 51.99 • 52 • 36 • 83 • 83.80 • 84 Na = 11- Cr = 24- Kr = 36-

  15. 13 B. 14 • C. 26 D. 27 13 + 13 Al Aluminum 26.98 • How many protons (+) does an atom of Aluminum have? • How many electrons (-) does an atom of Aluminum have? • How many neutrons (=) does an atom of Aluminum have? • 13 B. 14 • C. 26 D. 27 13 - 27 (mass #) -13 (atomic #) 14 = • 13 B. 14 • C. 26 D. 27

  16. 12 B. 13 • C. 24 D. 25 12 + 12 Mg Magnesium 24.31 • How many protons (+) does an atom of Magnesium have? • How many electrons (-) does an atom of Magnesium have? • How many neutrons (=) does an atom of Magnesium have? • 12 B. 13 • C. 24 D. 25 12 - 24 (mass #) -12 (atomic #) 12 = • 12 B. 13 • C. 24 D. 25

  17. 15 B. 16 • C. 30 D. 31 15 + 15 P Phosphorus 30.97 • How many protons (+) does an atom of Phosphorus have? • How many electrons (-) does an atom of Phosphorus have? • How many neutrons (=) does an atom of Phosphorus have? • 15 B. 16 • C. 30 D. 31 15 - 31 (mass #) -15 (atomic #) 16 = • 15 B. 16 • C. 30 D. 31

  18. How many protons (+), neutrons (=), and electrons (-) does an atom of Boron have? • 5 (+), 5(=), 5(-) B. 11(+), 11(=), 11(-) • C. 5 (+), 6(=), 5(-) D. 5(+), 11(=), 5(-) • What is the atomic # of Neon, and how many protons (+) and neutrons (=) does an atom of it have? • At#10, 20(+), 10(=) B. At#10, 10(+), 10(=) • C. At#20, 10(+), 10(=) D. At#10, 10(+), 20(=) • What is the atomic # and mass of Fluorine, and how many electrons (-) does an atom of it have? • At#10, mass 19, 10(-) B. At#19, mass 9, 9(-) • C. At#9, mass 10, 9(-) D. At#9, mass 19, 9(-) Fill in the table below. 6 5 5 10 10 10 19 9 9

  19. 5 B Boron 10.81 - - - - - = + + = = 2nd Row + = = = + + Energy Levels • # shells = # of ROW on Periodic Table 2 Energy Levels

  20. 5 B Boron 10.81 - - - - - = + + = = 5 Electrons + = = = + + Where do the Electrons go? • 1st Shell = No more than 2 • 2nd Shell = No more than 8 • 3rd Shell = No more than 8 • Last Shell = # of COLUMN on Periodic Table 2 Electrons in 1st shell B is in 3rd Column  3 electrons in last shell

  21. Diagram Atoms 1 -18 • Teacher demonstrates diagramming atoms with atomic #1, #2, #3, #10, #18 • Students work with partners – one sheet of paper per team. • Take turns diagramming the atoms. While one draws, the other checks work. • One person diagrams the odd numbered elements, partner checks work. • The other person diagrams the even numbered elements, partner checks work.

More Related