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.
The masses of any two atoms of the same element are not always the same. Atomic mass (the mass you see on the periodic table) is just a weighted average of all of the weights of all of the different isotopes of an element.
No, an element in the activity series can only replace another element if it is higher on the series. Elements higher on the series are more reactive and can displace those below in a single displacement reaction.
Atoms are normally identified according to the element of which that atom is an example. And that, in turn, is determined by the number of protons in the atom's nucleus. So, any atom that has just one proton is a hydrogen atom. If it has two protons it is a helium atom. And so forth.
No, tap water is not an element. It is a compound made up of two elements, hydrogen and oxygen.
Tungsten has the highest freezing point of any known element at 3695°C.
Atomic Mass
yes
The atomic number of an element is equal to the number of protons in the nucleus of that element; it will identify the element. The number of neutrons of a given element may be different as the element may have a number of isotopes.
Yes you can recognize it. We use atomic number for that.
Holsteins have more than one "trace element" in them. So there is no particular trace element of a particular breed of cow, or any other animal for that matter.
Logan Henderson has never identified himself as an Athiest, or of any particular religion. The true answer is "unknown".
The last element in any period always has its outermost electron in the same type of atomic orbital, either an s or p orbital.
Logan Henderson has never identified himself as an Athiest, or of any particular religion. The true answer is "unknown".
The number of protons.
The empty element is a subset of any set--the empty set is even a subset of itself. But it is not an element of every set; in particular, the empty set cannot be an element of itself because the empty set has no elements.
Which of these is always true of atoms? protons, electrons AND neutrons are always equal in number they are always bonded to another atom they always have a charge they are always neutral in elements
There are no such elements: the atomic number is a unique property of each particular element and is not shared with any other element.