Pre-Test
+ stand for what charge?
Positive?
Three subatomic particles.
What are protons, neutrons, and electrons?
What is surrounded by electrons and has a central nucleus?
An atom
This phase of matter has the slowest moving particles
solid
- stands for what type of charge?
negative
particles of an atom that have NO charge are called
neutrons
Banana changing color is an example of a ______ change
chemical
An atom that is neither positively or negatively charged.
neutral
how many sub-atomic particles make up an atom
3
liquid to gas phase change
Evaporation
Neutrons are negatively charged. True or False?
false!
If an atom has 5 electrons what else do we know?
It has 5 protons
name the sub atomic particles.
proton, neutron, electron
2nd step of the scientific method
ask a question
Most of an atoms mass comes from where?
Nucleus
When an atom gains an electron it has this kind of electrical charge.
negative
The number of electrons are equal to the number of___
Protons
Electrons are located in _____ that surround and atom.
shells
Phase change from a solid to a liquid
melting