Fermi
·
Concept Library
·
Courses
·
Books
·
Problems
·
Simulations
·
Math Wiki
·
High School
Fermi
›
Problems
Chemistry
Chemistry
Problem
The electron in the third Bohr orbit of Li
2
+
^{2+}
2
+
(
Z
=
3
Z = 3
Z
=
3
) has the same speed as an electron in the fifth Bohr orbit of a hydrogen-like ion X
(
Z
−
1
)
+
^{(Z-1)+}
(
Z
−
1
)
+
. What is the atomic number
Z
Z
Z
of element X? a)
4
4
4
b)
5
5
5
c)
3
3
3
d)
8
8
8
Browse the problem library