The Cobalt Group. After heated discussion with a Physic professor, I finally got him to recognize Group 9 elements have a total of 9 valence electrons and therefore have no business being labeled as VIIIB elements.
Halogen, group 9, atomic number 17
Fluorine is number 9.
9
Meitnerium belongs to the transition metal family. It is a synthetic element with the symbol Mt and atomic number 109.
Ir refers to iridium element that is placed in group-9 and period-6 in the modern periodic table.
Cobalt (element number 27) is classified as a "Transition Metal" and is located in Group 9 of the Periodic Table. Transition Metals are ductile, malleable, and able to conduct electricity and heat.
9
Fluorine (symbol F) is an element found in group 17 and period 2 on the periodic table
Yes, fluorine is the most reactive element on the periodic table.
The atomic number of iridium is 77. Its symbol is Ir. It is placed in group-9 and period -6 in the periodic table.
This element is potassium (K).
all of them are very rare in the earth's crust