The mendeleev and moseley periodic charts had
gaps for undiscovered elements. why do you think the chart used by moseley was more accurate at predicting where new elements would be placed?

The chart used by Moseley was more accurate at predicting where new elements would be placed - due to fact that Moseley's chart was based on using the atomic number of the element, not the chemical properties or the atomic mass as Mendeleev.

Mendeleev's table had organized the elements by their atomic mass whereas Moseley's table had organized the elements by their atomic number.

Thus, due to fact that Moseley's chart was based on using the atomic number of the element, not the chemical properties or the atomic mass as Mendeleev.

Learn more:

link

Here are all of the answers for the page you are on

12.N - Atomic mass: 14.007 Atomic number: 7   outermost: 2P - Atomic mass: 30.974 Atomic number: 15 outermost: 3 As - Atomic mass: 74.922 Atomic number: 33 outermost: 4Sb - Atomic mass: 121.757 Atomic number: 51 outermost: 513.Mercury- Hg, 12, 6Iodine- 1, 7, 5Sodium- Na, 1, 3Nitrogen- N, 5, 214.K- potassium, metalSi- silicon, metallidS- Sulfur, nonmetal15.The Moseley chart was based on using the atomic mnumber of the element, not the chemical properties. Because of the similarities between elements of the same period, this often created problems in establishing an order; Moseley's work enabled the change of the atomic number from an arbitrary selection to a definable property, measurable through experimentation.

Explanation:

12.N - Atomic mass: 14.007 Atomic number: 7   outermost: 2P - Atomic mass: 30.974 Atomic number: 15 outermost: 3 As - Atomic mass: 74.922 Atomic number: 33 outermost: 4Sb - Atomic mass: 121.757 Atomic number: 51 outermost: 513.Mercury- Hg, 12, 6Iodine- 1, 7, 5Sodium- Na, 1, 3Nitrogen- N, 5, 214.K- potassium, metalSi- silicon, metallidS- Sulfur, nonmetal15.The Moseley chart was based on using the atomic mnumber of the element, not the chemical properties. Because of the similarities between elements of the same period, this often created problems in establishing an order; Moseley's work enabled the change of the atomic number from an arbitrary selection to a definable property, measurable through experimentation.

answer; i believe that the correct answer is (a) potassium(k)