Chapter 6 The Periodic Table and Periodic Law

Halogens are good disinfectants. Which of the following is a halogen? 

How many protons and electrons are present in Al³⁺? 

Atoms of elements in group 1A have ____________.

Which group on the periodic table is known as the alkaline earth metal?

Which of the following elements is a metalloid?

Columns on the periodic table are known as __________

Which block consists of the elements in groups 3A through 8A?

Which of the following are poor conductors of heat and electricity?

Which atom or ion has 16 protons and 18 electrons?