Question

Choose four elements from anywhere in the periodic table. Record their masses in the table. Explain how their masses relate to each other and their positions on the table.

Answer 1

Hydrogen-1.01
Helium-4.00
Oxygen-16.00
Carbon-12.01

The mass of each element comes from the total number of protons and neutrons.

Elements are organized on the periodic table by their atomic number which is their number of protons

This means that further you go down a group (column ) or to the right across a period (row) the larger the atomic number and subsequently mass number will be.

Hope that helped!