Calculate the time needed for a constant current of 1.00 A to deposit 0.450 g of (a) Tl(III) as the element on a cathode. (b) Tl(I) as Tl2O3 on an anode. (c) Tl(I) as the element on a cathode.

Which of the following statements is true? a. elements in the last period are radioactive. b. atomic weight is the same as atomic mass. c. elements in the same group have the same number of electron shells. d. atomic number equals the number of neutrons in the nucleus of an atom.

One does not belong why? ice, gold ,wood ,diamond and table salt

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