1,2 and 13-18 the number is how many valence electrons it has.
The number at the top of each column in the periodic table is the group number. It indicates the number of valence electrons an element in that column has, which influences its chemical properties. Elements in the same group tend to have similar chemical behavior due to their shared number of valence electrons.
It is the Atomic Number.
The columns in the periodic table are groups, also called families because the elements in a group have similar properties.
your groups number
It is number six in the Periodic Table.
There is no Fn on the periodic table of elements. However, there is Fm, Fermium, number 100.
I am assuming you mean to ask why elements go into specific groups Elements that have the same number of valence electrons are put into the same group. Because they all have the same number of valence electrons, it could also be said that elements are put into groups based on their chemical properties.
Th is element number 90 on the periodic table It is thorium, it is in the Actinides, and it is radioactive
my dining room table have number 152-33 what dose mean
Groups in the periodic table are made of columns that go up and down and are called groups or families. Each group/family has elements that share similar chemical properties because they have the same number of electrons in their outermost energy level.
In the periodic table, elements in the same group, or family, have similar properties. This is because the number of valence electrons is consistent within groups. For example, the Noble Gases all have 8 valence electrons.
If, by "equal groups", you mean groups of equal things, you get how many in all [the total number] by simply addingthem all together. Sometimes adding is called summation.If, by "equal groups", you mean equal-sized groups of things, you get how many in all by multiplying the number of groups by the number of things in each member group.The number of things in a group is also called its cardinality. Loosely, cardinality is the size of the group, or the number of elements ["things"] in the group.