material (structure of matter part 1)

anything that has mass and volume

the atom is neutral due to

the mass number of the same element can be different due to

• absence of isotopes
• existence of isotopes
• the atom carries a neutral charge
• presence of neutrons

the atomic number equals the number of neutrons

• true
• false

Atomic mass = Number of protons+ number of electrons

• true
• false

isotopes have the same atomic number

• true
• false

isotopes have the same physical properties

• True
• False

to change the state of matter ........ energy is used

• potential
• thermal
• sound
• mechanical energy

to change from liquid to solid we use the ......... process

• condensation
• ionization
• solidification
• vaporization

changing from one state of matter to another is irreversible

• true
• false