Chemistry, 23.08.2021 21:20 larageorge
Why has the arrangement of the periodic table changed over time?
A. Mendeleev had not placed the elements in any particular order.
B. The atomic number of an element changes so the table is frequently rearranged.
C. The table was rearranged to show elements in order of increasing atomic number rather than increasing atomic weight.
D. Elements are removed from the table once they can no longer be found in nature.
Answers: 1
Chemistry, 22.06.2019 00:20, paulawells11
What are the spectator ions in 2h+ + so42- + ca2+ + 2r → caso4 + 2h+ + 21?
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Chemistry, 22.06.2019 12:30, hala201490
Place the elements below in order of decreasing ionization energy. aluminum(al) chlorine(cl) magnesium (mg) sulfur(s)
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Chemistry, 22.06.2019 16:00, hjgjlgkjg
Inside a flashbulb, oxygen surrounds a thin coil of magnesium. when the flashbulb is set off, a chemical reaction takes place in which magnesium combines with oxygen to form magnesium oxide. which of the chemical equations matches the reaction above? a. mg + o2 mgo2 + energy b. 2mg + o mg2o + energy c. 2mg + o2 2mgo + energy d. mg + o mgo + energy
Answers: 1
Why has the arrangement of the periodic table changed over time?
A. Mendeleev had not placed the e...
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