Chemistry, 03.02.2021 22:20 firdausmohammed80
How does the number of valence electrons change for atoms as you move in order from element 1, Hydrogen (M), to element 18, Argon (An), on the periodic table?
The number of valence electrons only increases
The number of valence electrons decreases across the period and then increases at the beginning of the next energy level
The number of valence electrons increases across the period and then decreases at the beginning of the nen energy level
The number of valence electrons only decreases
Answers: 2
Chemistry, 22.06.2019 21:30
Achemical reaction is done in the setup shown, resulting in a change of mass. what will happen if the same reaction is done in a sealed container that is placed on the electronic balance?
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Chemistry, 22.06.2019 22:30
Which statement best summarizes the importance of ernest rutherford’s gold foil experiment? it proved that all of john dalton’s postulates were true. it verified j. j. thomson’s work on the atomic structure. it showed that an electron circles a nucleus in a fixed-energy orbit. it showed that a nucleus occupies a small part of the whole atom.
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Which best describes the present-day universe? opaque, expanding very slowly, stars produce heavy elements transparent, expanding at an accelerated rate, stars produce heavy elements opaque, expanding at an accelerated rate, stars produce only hydrogen and helium transparent, expanding very slowly, stars produce only hydrogen and helium
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How does the number of valence electrons change for atoms as you move in order from element 1, Hydro...
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