PHET: Isotopes and Atomic Mass

Beryllium (Be) has only one stable isotope. Use the sim and the periodic table to answer. What is the average mass of 2 atoms of Berryllium (Be)?

• 9.01218 amu

• 18.99840 amu

• 18.02436 amu

• 4.50609 amu

Fluorine (F) has only one stable isotope. Use the sim and the periodic table to answer. What is the average mass of 3 atoms of Fluorine (F)?

• 9.01218 amu

• 18.99840 amu

• 37.9968 amu

• 9.4992 amu

Lithium has only two stable isotopes. Use the sim to determine the atomic mass of Lithium-6.

• 12.03024 amu

• 7.01600 amu

• 6.01512 amu

• 3.00756 amu

Tags

NGSS.HS-PS1-8

Lithium has only two stable isotopes. Use the sim to determine the atomic mass of Lithium-7.

• 12.03024 amu

• 7.01600 amu

• 6.01512 amu

• 3.00756 amu

Lithium has only two stable isotopes. Use the sim to determine the average atomic mass of a sample containing three lithium-6 atoms and two lithium-7 atoms.

• 6.51556 amu

• 6.61565 amu

• 6.34875 amu

• 6.41548 amu