Question

a chemist, is running tests with four unknown
ments. he has found that they all bond the same
y, so he knows that they are in the same group
the periodic table of elements. the table shows
er properties that eriq observed.
these four elements are most likely in group
15.
16.
17.
18.
properties of four unknown elements

Explanation:

Group 17 (halogens) have elements that can exist in different phases (solid, liquid, gas) at room temperature. Group 15 elements are mostly solids (except nitrogen - gas). Group 16 has oxygen (gas), sulfur (solid) etc., but the phase behavior of group 17 is more in line with the given data. Group 18 (noble gases) are all gases at room temperature.

Answer:

17.