Since the d orbital can hold 10 electrons, half filled would mean it has 5 electrons. The element in period 6 that has 5 electrons in the d orbital would be Rhenium (Re).
It is rhenium.
CARBON
The element is Yttrium, with the symbol Y
The element is francium.
No, it is not. It is a transition element
You would have to determine the electron configuration for atoms of a given element. Each s sublevel contains 1 orbital, each p sublevel contains 3 orbitals, each d sublevel contain 5 orbitals, and each f sublevel contains 7 orbitals. Click on the related link to see a periodic table that shows electron configurations for the elements.
The elements belonging to Group IA and IIA.
An atom with an incompletely filled outermost energy level is likely to be reactive. This is because it wants to acquire a filled outermost energy level.
CARBON
Radium
The element that has a single electron in the 2p sublevel is boron. The electron configuration of Boron is 1s22s22p1.
The highest sublevel that Promethium can have is 4f. It is possible for 14 electrons to be placed around Promethium, since the elements in this sublevel each have 7 orbitals.
Ca
Ca
Ca
Ca
Most scientists describe a "transition metal" as any element in the d-block of the periodic table, which includes groups 3 to 12 on the periodic table. The f-block 'lanthanide and actinide' series are also considered transition metals and are called "inner transition metals".
Transition