| Question | Answer |
|---|---|
| Protons and neutrons are the ______________of an atom | nucleus |
| you can identify an element if you know its atomic number or_____________ | protons |
| in the periodic table , the number of an element is the___________ above its symbol | whole number |
| The nucleus of an atom contains______________ and neutrons | protons |
| the nucleus has a ______________and the _____________ of the atom | Positive charge, most mass |
| an electron is a _____________particle located outside the nucleus | negatively charged |
| The modern model of an atom is called the___________ model | electron-cloud |
| Electrons that close to nucleus have_________ than electrons that are farther from the nucleus | less energy |
| The atomic number of ____________ in the nucleus of an atom of an element | protons |
| Isotopes have the same number of protons but different numbers of ______________ | neutrons |
| An ion has a charge because it has gained or lost____________ | electrons |
| A _____________ ion has more protons than electrons | positive |
| Adding a ____________ to a neutral atom produces a new element | proton |
| ___________ is positively charged particle in the nucleus of an atom | proton |
| ___________ is a region surrounding an atom's nucleus where one or more electrons are often found | electron cloud |
