Mg - Magnesium
Assuming we're dealing with a neutral atom, you're thinking of manganese (Mn). It has 25 protons and is a transition metal in period 4, group 7B on the periodic table.
The element with Atomic number 30 is "Zn" Zinc.
Sodium is an alkali metal.
iron
Manganese
manganese
It is manganese.
In a stable, Neutral system, the protons and electrons will be equal. The element with atomic number 25 is Manganese (Mn), See the periodic table
25 electrons.... ( as the number is 25 : being 25 protons and 25 electrons)
nickel has 28 electrons and is in the metal family
The transition metal with 25 electrons that starts with an O is the element named "osmium" (Os). It belongs to the platinum group of metals and has a dense, bluish-white appearance. Osmium is commonly used as an alloying agent in the production of hard and durable materials.
Calcium is a metal that has two valence electrons.