A neutral atom of beryllium (Be) has an average mass of 9 amu and 4 electrons. How many neutrons does it have?

13

9

5

4

What are two methods for writing a balanced formula

A balloon with a volume of 2.0 L at 25°C is placed in a hot room at 35°C. The pressure on the balloon is constant at 1.0 atm. What is the final volume of the balloon after it has been placed in the hot room?

Which of the following substances has a molar mass of 208g

Which occurs whenever valence electrons are shared or transferred between atoms? 1. A decrease in charge. 2. An increase in charge. 3. Radioactive decay. 4. A chemical reaction.

What is responsible for the three dimensional structure of this molecule?

Which of the following locations would most likely have the most fertile soul?

What is an "alloy" in the chapter of metals in chemistry?

Which one of the atoms shown would be most likely to form a cation with a charge of 1?

Name 5 descriptions of a key including mass

How many moles of hydrogen gas will form 1.35 L of a 2.75 M Hcl solution reacts?