Unit Two - Biochemistry - Chemical Bonds Flashcards
Definition of Atom
Basic Building Block of Matter
Definition of Subatomic Particles
Smaller than an Atom
Examples of Subatomic Particles
- Protons
- Neutrons
- Electrons
Definition of Proton (Role is optional, but it is helpful to read through it for chemistry)
- Charge - Positive
- Location - Atom’s Nucleus
- Role - # of Protons determines Element’s Atomic Number
(# of Protons = # of Electrons)
Definition of Neutrons (Role is optional, but it is helpful to read through it for chemistry)
- Charge - None/Neutral
- Location - Atom’s Nucleus
- Role - Contributes to Atom’s mass and helps stabilize nucleus
Definition of Electrons (5)
Charge, Location, Purpose, Extra Info
- Charge - Negative
- Located Outside Nucleus
- # of Electrons = Atomic
- Responsible for Covalent Bonds
- Orbits nucleus in energy levels
Info on Levels of Electrons
1st Level - 2 Electrons
2nd Level - 8 Electrons
How do you know an electron’s potential energy?
Closer to Nucleus: Lower PE (more neg.)
Farther from Nucleus: Higher PE (less neg.)
When an atom loses potential energy, it drops to the 1st level. When an atom gains potential energy, it rises to the second level.
Definition of Valence Electrons (2)
- Electrons on outermost level
- # of electrons that don’t fill the level’s spots determines # of covalent bonds formed
Ex: Carbon
4 empty spots on 2nd energy level
Can form up to 4 bonds
Definition of Electronegativity (4)
- Measure of the atom’s ability
- To attract and hold onto electrons
- When a chemical bond is formed
- Oxygen is the most electronegative
Definition of Ionic Bonds (4)
- Type of Chemical Bond
- One atom transfers electrons to another atom
- Creates oppositely charged ions
- Attracts and bonds together
For example, in sodium chloride (NaCl):
Sodium (Na) loses one electron to become Na⁺.
Chlorine (Cl) gains that electron to become Cl⁻.
Cation
The atom that loses electrons to become positively charged
Ex: Na⁺
Anion
The atom that gains electrons to become negatively charged
Ex: Cl⁻
Definition of Ion
A charged atom due to the transfer of electrons
Definition of Nonpolar Covalent Bonds (3)
- Equal electron distribution
- Same electronegativty
- Neautral charges