What is the formula of the ion formed when cadmium achieves a pseudo-noble-gas electron configuration? consult the periodic table. cd2- cd+ cd3+ cd2+?

and the electron configuration of Cd²⁺ is

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 4d¹⁰

i look it up online and i'll tell you

the density(ratio between mass and volume as m/v) decreases from top to bottom in periodic table group as the size increases and nuclear charge decreases. but in periods density increases from left to right as atom size decreases and nuclear charge increases.