Question

Looking at the periodic table, elements arranged horizontally increase by what?

Answer 1

Proton number.

Explanation:

The elements in the periodic table is arranged by an increase in atomic number, also known as proton number. This is because the increase in atomic number affects the chemical properties.

For example, sodium, an atomic number of 11 when heated with chlorine, produces sodium chloride with a pH number of 7. Whereas magnesium, an atomic number of 12, when heated with chlorine, produces a salt, magnesium chloride, which has a slightly lower pH value than sodium chloride, pH value of 6.5.