chemical basis of life Flashcards
classification of elements
1) primary biogenic e.
most common found in all (important)
2) secondary biogenic e.
important, not always there
3)trace e.
very rare, only in certain
4)non biogenic e.
1,2,3 can be found in living organisms.
4 cannot be found
subatomic particles
protron +
neutron
electron -
proton = neuclous = atomic nucleous = atomic mass
of protons = # of electrons
isotopes
carbon
6p, 6n - 6p 8n
- they are same element because electrons
- but have different number of neutrons which makes it an isotope
electron shells
of electrons who electrons have same energy level
outermost electron shell- valence electrons
determines combinging properties of atoms
compounds
different elements at a fixed ratio
ex. CO2 = 1:2, MgCl2 = 1:2
^ simple chemical form
covalent bonds
share electrons with another. due to the want an element has of an electron
ionic bonds
- transfer electron
- they give electrons
- above 1.7 they give
cation
positive ion
anion
negitive ion
covalent compound, ionic compound
differnece of electronegitivity determines if the bond is ionic or covalent
primary bonds
- strong
- determine chemical properties
- intramolecular-inside
secondary bonds
- weaker
- determine physical properties ex. melting point
- intramolecular- between molecules
polar bond
when one has more electrons
big bully because hes negitive
nonpolar bond
when they equal the same
