which of the following is an example of a mixture
a. water
b. salt
c. oxygen gas
d. air
d. air
particles in a solid are packed tightly: true or false
particles in a solid have thermal energy: true or false
particles in a solid are completely still: true or false
True
True
False
the nucleus of an atom is found in the atoms center: true or false
the nucleus of an atom contains at least one proton: true or false
a neutron has a positive electrical charge: true or false
most of an atoms mass is found in protons and neutrons: true or false
True
True
False
True