potassium calcium sodium magnesium aluminum, zinc iron tin lead hydrogen, copper mercury silver platinum.

homophonic: marry that beautiful woman, lean forward and weigh 1 Jin. Expanded content:

valence of junior middle school:

potassium, sodium, hydrogen, silver, positive monovalent, calcium, magnesium, barium, zinc, positive divalent,

copper, iron,

aluminum is positive trioxide and negative two, chlorine is negative one,

sulfur is negative two positive four six, positive two positive three iron is variable,

positive four silicon, two four carbon.

negative hydroxyl mononitrate, negative carbonate disulfate,

negative three remember phosphate, positive one is ammonium,

other elements have valence changes, so it is calculated after death.

univalent potassium hydrogen chloride sodium silver, bivalent barium oxygen calcium magnesium zinc.

aluminum, silicon, pentavalent phosphorus, carbon, nitrogen.

two, four, six, sulfur, iron, two, three, copper and mercury are valence-changing.

the zero valence of simple substance will never change.

potassium, sodium, silver, hydrogen and ammonia, calcium, copper, magnesium, barium and zinc, aluminum, silicon, phosphorus, phosphorus, chlorine, oxygen and two, iron, hydrogen, oxygen, nitrate, nitrate, sulfate and sulfur are all complete.

lithium monohydride, potassium sodium silver, calcium magnesium barium zinc mercury.

positive aluminum, negative dioxygen.

valence formula

fuwan iodine is negative.

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cuprous chloride, cuprous chloride.

ferrous iron, ferric iron.

negative monohydroxide nitrate,

negative disulfate carbonate,

positive monovalent ammonium.

univalent sodium hydrogen chloride potassium silver

bivalent magnesium oxide calcium barium zinc

trivalent element uranium terbium aluminum

tetravalent carbonic acid

pentavalent phosphorus.