What is the charge on an ion that has an atomic number of 27 and contains 26e−?

+1

Explanation:

Atomic number 27, that means atom has 27 protons, nucleus charge = + 27'

26e− have charge -26.

+27-26 = +1 is ion charge

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.

i think that the answer is c