atomic structure - Atomic Structure 1 F321 THE STRUCTURE OF...

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
THE STRUCTURE OF ATOMS ATOMS Atoms consist of a number of fundamental particles, the most important are ... MASS NUMBER & ATOMIC NUMBER Atomic Number (Z) Number of protons in the nucleus of an atom Mass Number (A) Sum of the protons and neutrons in the nucleus Relative Atomic The mass of an atom relative to the 12 C isotope having a value of 12.000 Mass (A r ) Relative Isotopic Mass Similar, but uses the mass of an isotope 238 U Relative Molecular Mass (M r ) Similar, but uses the mass of a molecule CO 2 , N 2 Relative Formula Mass Used for any formula of a species or ion NaCl , OH¯ Atomic Structure 1 F321 Na 23 11 Mass number (protons + neutrons) Atomic number (protons) Mass / kg Charge / C Relative mass Relative Charge PROTON NEUTRON ELECTRON Protons Neutrons Electrons Charge Atomic No. Mass No. Symbol A 19 21 19 B 20 Neutral 40 C + 11 23 D 6 6 Neutral E 92 Neutral 235 F 6 6 13 G 16 2- 16 H 27 Al 3+ A r = average mass per atom of an element × 12 mass of one atom of carbon-12 Q.1
Image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
ISOTOPES Definition Atoms with ... the same atomic number but different mass number or the same number of protons but different numbers of neutrons .
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern