kaywendel2008
19.05.2021 •
Social Studies
If a train traveled 6,840 km for 72 hours how far did it travel
123,120 km/h
1,140 km/h
684 km/h
95 km/h
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Ответ:
For example, silicon has 14 protons and 14 neutrons. Its atomic number is 14 and its atomic mass is 28. The most common isotope of uranium has 92 protons and 146 neutrons. Its atomic number is 92 and its atomic mass is 238 (92 + 146).
...
2.1 Electrons, Protons, Neutrons, and Atoms.
ElementHydrogen
SymbolH
Atomic No.1
Number of Electrons in Each ShellFirst1
Explanation: