material (structure of matter part 1)

anything that has mass and volume

(a)  

the atom is neutral due to

(a)  

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