JAMB - Chemistry (2021 - No. 30)
An element having the atomic number 17 will resemble which of the following elements having atomic number as given below?
33
35
18
19
설명
The Group 7 elements are called the halogens. They are placed in the vertical column, second from the right, in the periodic table .
Chlorine (17), bromine(35) and iodine(53) are the first three of the Group 7 elements.