Metals are the elements that usually lose electrons in their chemical reactions. This is because they have few electrons in their outermost shells which are easily lost.
Tungsten generally loses electrons when forming bonds, it is a metal
silicon
Enzymes are basically catalysts, and they act just how you'd expect a catalyst to.
39K19 refers to the element potassium. Potassium is an alkali metal that tends to form ionic bonds due to its tendency to lose an electron and achieve a stable octet configuration. Therefore, you would expect 39K19 to form ionic bonds with other elements by donating its one valence electron.
Caesium is freshly cut, it have a metallic shine, but this disappears rapidly due to reaction of exposed metal surface with oxygen in the air
Tungsten generally loses electrons when forming bonds, it is a metal
Since argon is a noble gas, I wouldn't expect much to happen; specifically, I wouldn't expect any chemical reaction.
silicon
silicon
You wouldn't expect strontium to gain electrons in a chemical change.
Enzymes are basically catalysts, and they act just how you'd expect a catalyst to.
Chemical reactions are either; endothermic, removing energy from the environment, or exothermic, emitting heat upon the environment.
I expect you mean Antoine Lavoisier. Please see the link.
Calcium is expected to lose electrons in a chemical reaction because it is a metal located in group 2 of the periodic table, which typically loses electrons to achieve a stable electron configuration. Calcium will typically form a 2+ cation by losing 2 electrons in reactions.
I would expect cesium, element 55, to be more reactive than potassium. This is because cesium is further down the alkali metal group in the periodic table, making it more eager to lose an electron compared to potassium.
39K19 refers to the element potassium. Potassium is an alkali metal that tends to form ionic bonds due to its tendency to lose an electron and achieve a stable octet configuration. Therefore, you would expect 39K19 to form ionic bonds with other elements by donating its one valence electron.
Caesium is freshly cut, it have a metallic shine, but this disappears rapidly due to reaction of exposed metal surface with oxygen in the air