Structure 1.2: The Nuclear Atom Flashcards
Feb 12 (13 cards)
What is the atomic model made up of
made up of a positively charged, dense nucleus(which contains the majority of atom mass)
What is the nucleus made up of
p^+ and n^0, collectively called nucleons.
the p+ and n0 each have a relative mass of 1
where are electrons located
electrons reside in space outside the nucleus and are responsible for the volume/diameter of an atom
what is the mass of e-
considered negligible (0)
proton vs electron for ions, atoms, cations, anions
atom= P+ = e-
cation = P+ > e-
Anion = P+ < e-
what does the atomic number (Z) represent
The number of protons in the nucleus
what does the mass number (A) represent
the number of protons and the neutrons in an atom. (whole number)
would isotopes of the same element have different mass numbers
yes because the number of mass numbers vary
differences between relative atomic mass (Ar) vs average atomic mass
relative Atomic mass= the mass provided on periodic table, the weighted average of the isotopes.
CHemically, isotopes behave simialrly
Facts about isotopes
-chem properties depend on valence e, which are the same for all isotopes of the same element
-physical properties depend on mass; heavier particles move more slowly and will have higher mp and dp and density.
Define radioisotopes
A type of isotope that is unstable due to having too many or too few neutrons
they will then emit radiation to move toward a more stable state
they behave chemically like their stable counterparts, so can be used as tracers to follow the movement of compounds in the body
how many decimal places for reporting atomic mass (Ar)
2 decimal places
Formula for calculating the relative relative abundance of isotopes
Ar (no units)= (%1 * m1) + (%2 * m2) +../ 100
