Groups or family's!
The groups in the periodic table tell you what each element within them will react with, the number of valance electrons the element has, and what family it is in.
The chemical formula for Ammonium is NH4+, it is not an element but a compound. Therefore it does not belong to any groups. Nitrogen(N) is in group 5 and Hydrogen(H) is in group 1.
Uup, or ununpentium with 115 electrons
No. NZ is neither an element, as no element has only 2 letters. Also, it is not the initials of any element.
Any element that is in one of the representative elemenet groups is a representative element. A representative element group is any of the groups 1-2, 13-18, i.e. not a transition metal. So, a representative element is an element that isn't a transition metal.
Severdice H264R
312 is the only number that equals 312. There isn't any other one.
312 is an integer and not a fraction. However, it can be expressed in rational form as 312/1. You can then calculate equivalent rational fractions if you multiply both, its numerator and denominator, by any non-zero integer.
Any of its factors
So-called NON-transition metals is not a defined group of elements, other than "All other elements that are NOT transition elements".
groups run top to bottom periods run left to right
The melting point of gadolinium is: 1 312 0C.
Element groups
Noble gases
Any multiple of 312.
Any multiple of 312