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Atoms and Matter
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 |