2_C1 1_3 Notes (1).pdf - We will start CHEM 110 with the nuclear model of the atom which states that an atom is made of protons neutrons and electrons

2_C1 1_3 Notes (1).pdf - We will start CHEM 110 with the...

This preview shows page 1 - 3 out of 3 pages.

Ion p + = 19, e - = 19 – 1 = 18 n 0 = 39 – 19 = 20 Neutral p + =9, e - = 9, n 0 = 19 – 9 = 10 We will start CHEM 110 with the nuclear model of the atom which states that an atom is made of protons, neutrons, and electrons. Mary J. Bojan Chem 110 F 19 9 + K 39 19 8 COMPONENTS OF ATOMS mass (amu) charge (au) proton p + ~1 +1 electron e - ~0 −1 neutron n 0 ~1 0 ATOMIC SYMBOL Atoms gain or lose electrons to form ions. Anion: Negatively charges species i.e. Cl Cation: Positively charge species i.e. Na + 17 p + 17 e - 20 n 0 (= 37 – 17) 17 p + 17 e - 18 n 0 (= 35 – 17) Isotopes are atoms with the same atomic number but a different number of neutrons Atomic Number = # of protons DEFINES the element: IDENTITY For a given element, the number of protons is fixed, but the number of neutrons can vary. Mary J. Bojan Chem 110 Cl 35 17 Cl 37 17 9 Different isotopes have different mass numbers… Same number of protons, Same number of electrons, Different number of neutrons
Image of page 1
Important Definitions Atomic Mass Unit (amu) = 1/12 the mass of a carbon-12 atom; 1 amu = 1.66054 x 10 –24 g Isotopic Mass = The relative mass of an isotope compared to
Image of page 2
Image of page 3

You've reached the end of your free preview.

Want to read all 3 pages?

  • Spring '08
  • HOFMANN,BRUCEROB
  • Atom, Chem, Isotope, Mary J. Bojan, nuclear model of the atom

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

Stuck? We have tutors online 24/7 who can help you get unstuck.
A+ icon
Ask Expert Tutors You can ask You can ask You can ask (will expire )
Answers in as fast as 15 minutes