Helium (He) Atomic Number: 2
This element is helium.
because there are only 14 electrons in the f orbital
Because it meets the criteria of the group and row as told and predicted by Mendeleev. The simplest reason it is in group 7 is because it has 7 electrons in it's outer shell!
Group 8 contains the noble gasses. They are nonreactive because they have a completed shell of electrons. Other elements react to try to get an outer shell that contains 8 electrons, but the noble gasses already have that so they don't need to react.
A family is a column in a periodic table; all elements in a family have similar physical and chemical properties, because they have the same numbers of valence electrons (outer electrons).
The number of Valence Electrons of Xenon is 8 because it is in the eighth group on the periodic table
Because Palladium is an element (it cannot be broken down into other substances) and the periodic table is a table of all of the elements we know of.
because on the periodic table they both have the same amount of electrons. 1
5 because it is in group 5 on the periodic table
Protons, because electrons are equal to the atomic number and protons are equal to the number of electrons.
Because they both have 5 electrons in their outer shell. This is the way that the elements in the periodic table were grouped.
Because they have the same number of valence electrons.