atomic number & mass of an element

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Last updated 12:45 PM on 9/8/26
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4 Terms

1
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dmitri mendeleev

1869

arranged chemical elements in order of increasing atomic mass w/ groupings of similar chem properties

Te ← I

2
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henry mosely

1913

measured characteristic x-ray frequencies of diff elements

INCREASES W/ ATOMIC NUMBER

3
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isotopes

variants of chemical elements

SAME PROTONS & ELECTRONS, DIFF CHEMICAL PROPERTIES

4
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ions

uneven number of protons and electros

either pos (cat) or neg (an) charge