BIOL 1201 Chapter : Chapter 2

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15 Mar 2019
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Chapter 2
I. Basic Chemistry
a. Element: substance that cannot be broken down to other substances
by chemical reactions
i. Essential elements
ii. Oxygen, carbon, hydrogen, and nitrogen make up 96% of living
matter
iii. Trace elements
b. Compound: a substance consisting of two or more different elements
combined in a fixed ratio
II. Atoms
a. Definitions:
i. Smallest unit of matter separable by normal chemical means
ii. Smallest unit of an element that retains all of the properties of
that element
iii. Fundamental unit of an element
b. Why is the atomic structure biologically important?
i. Atoms make up elements elements make up life
ii. Organisms are composed largely of 11 basic elements
c. Subatomic particles
Particle
Mass
Electric Charge
Proton
1 dalton
+1
Neutron
1 dalton
0
Electron
~0 dalton
-1
i. Atomic number: the number of protons in an atom
1. Defines the element
ii. Atomic mass: the number of protons and neutrons in an atom
iii. Changes in subatomic particles
1. Change in # of electrons change in charge
2. Change in # of neutrons change in mass (creates an
isotope)
Element
Protons
Neutrons
Electrons
Atomic
Number
Hydrogen
1
0
1
1
Helium
2
2
2
2
Carbon
6
6
6
6
Carbon 14
(isotope
more/less
neutrons)
6
8 (greater
mass)
6
6
Nitrogen
7
7
7
7
Oxygen
8
8
8
8
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3. Change in # of protons change in element
d. Atomic structure
i. Bohr Model
1. Protons and neutrons are in the nucleus
2. Electrons moving in orbitals or shells around the
nucleus
a. Try to be in lowest orbital or energy shell (that is
close to the nucleus)
b. K shell holds 2 electrons
c. L shell holds 8 electrons
d. M shell holds 8 electrons
e. Begin by loading innermost shell
e. Valence
i. The number of electrons that need to be gained or lost to fill
the outer shell of electrons
ii. Predicts the number of bonds that an atom will form
iii. Note: (valence electrons: the number of electrons in the outer
shell)
Element
Proton
Neutron
Electron
Valence
Hydrogen
1
0
1
1
Can only form
1 bond (ex:
water
molecule)
Helium
2
2
2
0
Noble Gases
group
Carbon
6
6
6
4
Can either gain
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