Biochemistry-SCH4U Review Flashcards
What are 6 types of atoms that make up 99% of all living organisms.
Oxygen
Carbon
Hydrogen
Nitrogen
Phosphorus
Sulfur
Percentage of human body weight that each atom makes up.
Oxygen-65.0
Carbon-18.5
Hydrogen-9.5
Nitrogen-3.3
Phosphorus-1.0
Sulfur-0.3
Matter Definition
Any substance in the universe that has mass and occupies space.
Matter is composed of what?
Extremely small particles called atoms.
Atoms are what?
The smallest unit of any given element.
Same Basic structure of every Atom
Core nucleus of both protons and neutrons
Orbiting cloud of electrons
Atomic # Meaning
of protons= # of electrons
Mass Number Meaning
Number of Protons + Neutrons
Charges of Subatomic Particles
Protons-Positive Charge
Neutrons-No Charge
Electrons-Negative Charge
Parts of Atoms
Nucleus
Shells
Parts of Nucleus
Protons
Neutrons
Isotopes Meaning
Atoms of the same element that vary in the number of neutrons
Same Number of Protons in Isotopes Result In
All isotopes of an element having the same chemical properties
Chemical Behaviour of Atom determined by what
Its electron configuration
Electron Configuration Meaning
The distribution of electrons in the atom’s electron shells
Chemical behaviour of an atom depends largely on the number of electrons in its
Outermost shell (valence electron/shell)
Atoms with incomplete valence shells are what
Chemically reactive
of electrons outermost electron shell can hold
8 electrons
of electrons first electron shell can hold
2 electrons
Octet rule meaning
Atoms tend to gain, lose, or share electrons so as to have 8 electrons
C would like to
Gain/lose 4 electrons
N would like to
Gain 3 electrons
O would like to
Gain 2 electrons
H would like to
Gain 1 electron
Atoms bond to what
Form compounds
What compounds are made up of
At least 2 different kinds of atoms (e.g., H2O)