Answer:
manganese, Mn
Explanation:
From the question, we have;
The number of electrons in the 3d sub level = 5
The kind of element = d-block element
On the periodic table, the elements with electrons in the 3d-sublevel in increasing order are;
Sc, 3d¹ 4s²
Ti 3d² 4s²
V 3d³ 4s²
Cr 3d⁵ 4s¹
Mn 3d⁵ 4s²
Fe 3d⁶ 4s²
Co 3d⁷ 4s²
Ni 3d⁸ 4s²
Cu 3d¹⁰ 4s¹
Zn 3d¹⁰ 4s²
The elements with 5 electrons in their 3d-sublevel are chromium Cr and manganese, Mn however the electronic configuration of chromium is given as 3d⁵ 4s¹ rather than 3d⁴ 4s² due to the minor difference in the gap of energy between the 3d and the 4s orbital as such the element that has the main characteristic of 5 electrons in its 3d sub level is manganese, Mn.
