Elements and Atoms

element:a substance that cannot be broken down any further into anythyng simpler.

atom: the smallest particle of an element that has the same chemical properties as the element.

nucleus: an atom's dense center, where most of its mass is.

electron: a negatively charged particle that moves around an atom's nucleus.

proton: a positively charged particle inside an atom's nucleus.

neutron: a particle with no charge inside an atom's nucleus.

atomic number: the number of protons in an atom.

                              

metal: any of a group of elements that conduct heat and electricity, is shiny and bendable.

Physical Properties

1.matter: any solid, liquid or gas.


2. mass: a measure of how hard it its to push or pull an object.



3.volume: the amount of space an object takes up.

 

4. density: the amount of mass in a certain volume of material.

5.physcal properties: a property that can be observed without changing the identity of a substance.

6.physical change: a change in size, shape, or state without forming a new substance.

7.solution: a mixture one substance dissolved in another so that the properties are the same throughout.

8.chemical change: a change in matter that produces a new substance with different properties from the original.