#s-block elements

Which of the following is an s-block element?

s-block elements have outermost electrons in s-orbitals (groups 1 and 2). Na (group 1) is an s-block element, while B (group 13), Si (group 14), and P (group 15) are p-block elements.

Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Modern Periodic Law and Present Form - Long Form Periodic Table