What are properties of the group of elements on the periodic table that have just one valence electron

answer: you could do some invislibe ink.

explanation: i will tell you how to if u answer my question.

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.

gold is my favorite solid.

there are two significant figures.