Question

1. when you select an atom, it will be sitting on the balance which shows you the mass. click on li. note the mass number. click on be. note the mass number. click on o. note the mass number. describe the change in the mass number of the atoms as you go from left to right in period 2. the mass number stays the same as you go from left to right in a period 2. the mass number decreases as you go from left to right in a period 2. the mass number increases as you go from left to right in period 2.

Explanation:

In the periodic table, as we move from left to right in a period, the number of protons and neutrons (which contribute to the mass number) generally increases. For example, Lithium (Li) has a mass number of 7, Beryllium (Be) has a mass number of 9, and Oxygen (O) has a mass number of 16. This shows an increasing trend.

Answer:

The mass number increases as you go from left to right in period 2.