Question

which ion has 18 electrons in its outermost orbit?
a Cu+
b K+
c Cs+
d Cl-

pls explain and answer and here its asked in the orbit

Answer 1

Atomic no. of Cu = 29=number of electrons
no. of electrons on Cu = 29-1=29
Electronic configuration= 2,8,18
Here, 18 electrons are in outermost shell.
Hence, the correct answer is (a)
mark this as brainliest plz

Answer 2

cu is the answer of the question