nialldyer913
nialldyer913 nialldyer913
  • 12-11-2016
  • Biology
contestada

The periodic table _____.
1. is arranged by atomic mass
2. is arranged by number of protons
3. was developed by early alchemists
4. is divided into vertical periods and horizontal groups

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shahzaib784
shahzaib784 shahzaib784
  • 12-11-2016
2................................................
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bundrenlilia
bundrenlilia bundrenlilia
  • 12-11-2016
is arranged by atomic mass
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