bio 106

cell

smallest unit of life

tissue

group of similar cells working together

organ

tissues working together

organ system

organs working together

organism

living thing

population

group of the same species living in one area

community

group of all organisms living in one area

ecosystem

organisms and non living organisms all together

three domains

Bacteria, Archaea, Eukarya

Prokaryotes belong to…

Bacteria + Archaea

Eukaryotes have a …

nucleus

Covalent bond

Atoms share electrons.

Ionic bond

Electrons are transferred, creating charged ions that attract each other.

Nonpolar covalent

Electrons are shared equally

polar covalent

Electrons are shared unequally

hydrogen bond

a weak attraction involving polar attraction

In what way are elements in the same column of the periodic table the same?

They have the same number of electrons in their valence shell.

Electrons exist only at fixed levels of potential energy. However, if an atom absorbs sufficient energy, a possible result is that

an electron may move to an electron shell farther away from the nucleus

The atomic number of neon is 10. Therefore, which of the following is most correct about an atom of neon?

It has 8 electrons in its outer electron shell and it is inert. A full outer shell makes neon inert, meaning it is very unlikely to react with other elements.

Which of the following molecules contains the most polar covalent bond

h2o

Which bond or interaction would be difficult to disrupt when compounds are put into water?

Covalent = strongest → difficult to break 💪

Higher electronegativity

stronger attraction for electrons.