Which of the following properties increase down a column in the periodic table? effective nuclear charge ionic radii ionization energy number of valence shell electrons

 The  properties that increase  down a column  in the periodic  table  is

Ionic radii

Explanation

In periodic table column is also referred  to as group.

Ionic radii  tend to increase  as you move  from top to bottom of the group.  This is because down the group there is increase of extra shell  which increases the distance  from the nucleus to outer shell.

The  ionization energy  and effective nuclear charge  decreases down the  group while  number  of valence shell electrons remain the same.

the answer would be b i believe

they it depends on if one believes about radioactivity, they make a geiger counter beep but maybe it was going to beep anyway electronics do wierd things all the time or it was programmed to beep near certain metals.