Question

1. beryllium (be) and fluorine (f) have only one stable isotope. use the sim and the periodic table to complete the following table: element beryllium (be) fluorine (f) mass of 1 atom 9.01218 amu 18.99840 amu average mass of 2 atoms (sim) average mass of 3 atoms (sim) atomic mass (periodic table)

Explanation:

Step1: Recall atomic - mass concept

The atomic mass of an element is the average mass of its isotopes weighted by their natural abundances. Since beryllium (Be) and fluorine (F) have only one stable isotope, the mass of 1 atom is equal to the atomic mass from the periodic table. The atomic mass of Be from the periodic table is 9.01218 amu and for F is 18.99840 amu.

Step2: Calculate average mass of 2 atoms

For beryllium, if we have 2 atoms, the average mass of 2 atoms is $2\times9.01218 = 18.02436$ amu. For fluorine, the average mass of 2 atoms is $2\times18.99840=37.9968$ amu.

Step3: Calculate average mass of 3 atoms

For beryllium, the average mass of 3 atoms is $3\times9.01218 = 27.03654$ amu. For fluorine, the average mass of 3 atoms is $3\times18.99840 = 56.9952$ amu.

Element	Mass of 1 atom	Average mass of 2 atoms (amu)	Average mass of 3 atoms (amu)	Atomic mass (periodic table)
Fluorine (F)	18.99840 amu	37.9968 amu	56.9952 amu	18.99840 amu

Answer:

The completed table is shown above.