A line.
Usually on the very top of every element.
Uranium
The atomic mass of a radioactively stable element is defined as the mass, usually measured in grams, of Avogadro's Number of atoms of the element as obtained from natural sources on Earth. For most elements, this atomic mass will be an average, weighted by natural isotope percentages, of the individual isotopes of the atom that naturally occur, but some elements have only one naturally occurring non radioactive isotope. The scale of atomic masses is now established by defining the mass of a carbon-12 isotope to be exactly 12. The atomic masses of other elements are defined by their mass ratios to a carbon-12 isotope.
Rocks are usually not elements, but they contain elements.
No, it is a compound of copper and tin.
An undefined term is usually applied to a function (or a part) where for some values of the operands the function is not defined within the field in which it is defined. It may be defined in a bigger field. For example, division by zero is not defined anywhere. Square roots of negative numbers are not defined in the domain of Real numbers, but they are perfectly OK in the Complex field.
Hydrogen
If a set, with multiplication defined over its elements has the identity property it means that there is a unique element in the set, usually denoted by i, such that for every element x in the set, x*i = x = i*x.If the elements of the set are numbers then i = 1.
The additive identity for rational, real or complex numbers is 0.
In psychology, emotion is a conscious and subjective experience that is usually characterized by the mental states and biological reactions.
Not usually, but it could be an element of a set.
That depends on the type of spoon and its construction:metal spoons are usually an alloy (a metallic "solid solution" of several different elements) and are sometimes also electroplated with a thin layer of another metal (usually a pure element like silver) on the surface; rarely are pure elemental metals used for the whole spoonplastic spoons are synthetic polymers (very complex organic compounds)wooden spoons are natural polymers (very complex organic compounds)ceramic spoons are inorganic compoundsetc.
Vitamin B Complex
Hydrogen is the first element because it has the simplest atomic structure with just one proton in its nucleus. This makes it have the smallest atomic number, which determines the element's position in the periodic table.
A list is an abstract data structure, usually defined as an ordered collection of data. A linked list refers to a specific implementation of a list in which each element in the list is connected (linked) to the next element.
In mathematics, an element usually refers to a member of a set.
The elements are identified by atomic number. The atomic number is equal to the number of protons in each atom of the element. Of course the elements are usually identified their symbols, which are arbitrary.