A ph less than 7 is an ___, with numbers indicating stronger acids.

A pH less than 7 is an acid, with number 1 indicating stronger acids

Explanation:

The pH scale has a range of 1 to 14. The following has been concluded on the pH scale:

1. Between 1 and 6 indicates an acid solution.

2. 7 indicates a neutral solution

3. Between 8 and 14 indicates an alkaline or basic solution.

Now with these information, we can answer the above questions as follow:

A pH less than 7 is an acid, with number 1 indicating stronger acids

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.