organization of matter

Question 1

what is an atom?

Answer 1

smallest unit of matter that still retains the properties of an element

Question 2

atoms are made over 100 subatomic particles, but only how many are important for biological compounds?

Answer 2

only 3

Question 3

proton (p +)

Answer 3

has a single positive electrical charge, carries a single positive charge

Question 4

electron (e -)

Answer 4

has a single negative electrical charge, carries a single negative charge

Question 5

neutron (n 0)

Answer 5

electrically neutral, carries no electrical charge

Question 6

what is a nucleus? what is it composed of? what moves around the nucleus?

Answer 6

nucleus: the central part of atom

it is composed of protons and neutrons

electrons move around the nucleus arranged in electron shells