Question

Question 3 (a)
Name three elements that have a single electron in their outermost shell.

Answer 1

The electronic configuration of lithium (3) is: 2, 1.
The electronic configuration of sodium (11) is : 2, 8, 1.
The electronic configuration of potassium (19) is: 2, 8, 8, 1.
Hence, lithium (Li), sodium (Na), and potassium (K) are examples of elements having single electron in their outermost shell.