I guess, the most fundamental is their valency. This dictates how many times it can bond to other elements. Elements with the same valency often share similar properties with other elements with the same valency. The Periodic Table is divided into 8 rows (and a D block). Each of these 8 rows have elements with similar properties, related to their valencies.
One important property of an element at room temperature is its state of matter, whether it is a solid, liquid, or gas.
to make one element a different element, all you need to do is have a different number of protons
Allotrope
It depends on which element is being referred to.
intensive property
One important property of an element at room temperature is its state of matter, whether it is a solid, liquid, or gas.
chemical property
A characteristic property of an element is its atomic number, which determines the element's identity on the periodic table. Each element has a unique number of protons in its nucleus, which is constant for that element regardless of its chemical state or conditions.
to make one element a different element, all you need to do is have a different number of protons
Alloy
Allotrope
Unanswerable question since it is unknown what KIND of PROPERTY is meant to be the most present in diatomic elements or which element has most of one (yet unknown) property. Please rephrase your question.
Carbon, nitrogen, and oxygen itself all have this property.
The smallest unit of Matter that retains the property of an element is the atom.
It depends on which element is being referred to.
Ununhexium is an element. And not a property.
Osmium is an element, it is not a property