Which of these are properties of elements on the periodic table? A. boiling point

B. melting point

C. cost of the element

D. brittle or not brittle

Melting point and Boiling Point

Explanation:

The properties of the periodic table include: color, density, melting point, boiling point, and thermal and electrical conductivity

A Melting point

B Boiling Point

Explanation:

The melting and boiling points of the Group 1 elements decrease on descending the group. This is due to a decrease in the forces of attraction between the atoms. On crossing a period in the Periodic Table the atomic size decreases. On descending a group the atomic size increases.

the first question's answer is a.