The lowest atomic weight between iron and tin is that of silver.
Silver (Ag) has the lowest atomic weight.
cadmium
Nitrogen is the least abundant element in the atmosphere of the Earth. The most abundant element in the atmosphere of the Earth is oxygen.
Most chemists consider tungsten to be the toughest/least breakable naturally occuring metal. Tungsten also has the highest melting point and the lowest vapor pressure. Chromium may come in a close second as naturally occuring.
Sodium is the least reactive in this triade.
Argon
Noble gasses are least reactive of all the elements. So the least reactive element in the period 4 is Krypton. It is a noble gas with an atomic number of 36.
cadmium
Cadmium.
zinc
Metallic
Assuming that "least nonmetallic" means the same as "most metallic", francium.
The element in Period 3 that has the greatest metallic character is magnesium. In periods, the metallic character decreases when atomic number increases.
It is the fourth least reactive element, followed by Mercury, Gold and Platinum.
Metallic bond, metallic positive grains surrounded by the electron cloud
No element contains any kind of bond except a metallic one. Ionic bonds can occur only between at least two different elements.
Refined and polished, it is indistinguishable from silver, at least upon casual inspection.
Bi, bismuth, is actually just an element. A compound is made up of at least two different elements bonded together.
Ionic compounds do not require the presence of a metal, for example ammonium chloride is ionic and does not contain a metallic element. What is true is that the majority of ionic compounds involve at least one metal.