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MGCCC BIOLOGY EXAM 1
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MGCCC BIOLOGY EXAM 1Atomic Number: The number of protons in the nucleus.
A cation is an atom with a positive charge (more protons than electrons).
An ion is an atom that has a negative charge (more electrons than protons).
Can or cannot the number of protons be changed? - ANSWER CAN NOT
(unless in stars)
Electrons are inserted as dots, beginning with the
Turn right and move clockwise.
isotopes - ANSWER: Change in the quantity of neutrons
Ions - Answer Change in the number of electrons.
Isotopes (Continued) - Answer Neutrons stabilize an atom, preventing protons
and electrons from
They're pulling each other apart.
Changing the quantity of neutrons causes the atom to destabilize.
gets radioactive.
Isotope applications include medicine (PET scans, FDA-approved isotopes, C14
tracing how carbon flows through plants, radiometric dating, etc.).
Half-life - ANSWER Time it takes for an atom to lose half of its energy.
covalent bond: electrons are shared.
Ionic bond - ANSWER electrons are stolen.
, hydrogen bond is a faint attraction between mildly charged atoms.
And a hydrogen atom.
Covalent bond example - Answer: oxygen.
Ionic bond example - salt
An example of a hydrogen bond: is water.
H2O - ANSWER: H and 0 share electrons, but not equally. We call this a.
Polar covalent bond!
Hydrogen bond (continued) - ANSWER faint attraction between a slightly + H
and a
slightly -atom on another molecule.
adhesion - ANSWER H2O binds to other H2O
cohesion - ANSWER H2O binds to anything else.
Hydrogen bonds are.... - Answer: wea. They form and break with ease...
Like high school relationships.
Together, hydrogen bonds are.... - ANSWER STRONG.
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