A symbol that represents an element on the periodic table is called

periodic table is a classification system for the elements. ... The symbols are abbreviations of the origins of the word for each element. For example, the origin of lead's symbol, Pb, is the Latin word 'plumbum' meaning 'liquid silver'. The number above the symbol is the atomic mass (or atomic weight).

2

Step-by-step explanation:

Given data

We have the function p(x)=(x-1)(x+1)

Let us find

p(2), p(1), and p(0)

p(2)= (2-1)(2+1)

p(2)= (1)(3)

p(2)= 3

P(1)= (1-1)(1+1)

p(1)= 0*1

P(1)= 0

p(0)= (0-1)(0+1)

p(0)= 1

Hence , p(2)+p(1)-p(0)​

=3+0-1

=3-1

=2