Question

20
Teacher suggested that the fifth mark in a group of five marks should be
shows the count to be five plus two (i.e. seven) and N N shows five
sed as a cross, as shown by 'N'. These are tally marks. Thus, N 1
plus five (i.e. ten).
With this, the table looks like :​

Answer 1

Explanation:

A chemical property is any of a material's properties that becomes evident during, or after, a chemical reaction; that is, any quality that can be established only by changing a substance's chemical identity