Question | Answer |
atom | smallest piece of matter |
protons | particles with an electrical charge - A positively charged subatomic particle. |
neutrons | neutral particles with no electrical charge |
atomic number | causes each element to be unique and different from other elements |
periodic Table | elements are placed in order by increasing atomic number |
electrons | a negatively charged subatomic particle. |
atomic mass | the weighted average mass of the isotopes of that element |
nucleus | the tiny central core of an atom and is composed of protons and neutrons |
mass number | the total number of protons and neutrons in an atom |
charge on a proton | +1 |
charge on an electron | -1 |
charge of an neutron | none |
location of protons | inside the nucleus |
location of electrons | outside the nucleus |
element | an substance that cannot be broken down into other substances by physical or chemical means |
amu | atomic mass unit |
importance of proton | determines atom's identity |
importance of electron | determines reactivity or how atoms interact with each other |
importance of neutron | holds protons/nucleus together |
properties that can be used to compare protons, electrons and neutro | charges, mass, and location |
the difference between two isotopes of the same element | isotopes of an element has the same atomic number but differ in mass because they have different number of neutrons |
the three subatomic particles | protons, neutrons and electrons |