biochemistry

matter

matter

all living things are made of

atoms

matter is made up of very small molecules called:

-protons -neutrons electrons

name the 3 subatomic particles

nucleus

center of an atom

protons + neutrons 0

which particles are in the nucleus

electron cloud

where do we find electrons

elements

substances made up of atoms that have the same number of protons called

6 protons

element of carbon have how many protons

isotope

atoms of an element have a different number of neutrons

8 neutrons

carbon 14 has 6 protons and _________

mass number

protons +neutrons

electrons

number of protons = number of _______ in a neutral atom

25 elements

essential to living organisms

carbon hydrogen oxygen nitrogen

4 essential elements

96%

4 main element make up what percent of the human body

chemically bonding

atoms of two diff kinds form by

2

how many electrons does the first ring hold

8

how many electrons does the outermost hold

ionic bonds

one atom gives up one or more electrons to another atom

covalent bond

share electrons

molecule

group of atoms held by covalent bonds

polar

electrons are not shared equally

yes

is water polar

positively charged hydrogen atoms and negatively charger oxygen atoms

weak hydrogen bonds form between