Question

understand main ideas

1. diagram sodium has 11 protons and 11 neutrons in its nucleus. draw a sodium atom. be sure to label the particles.
2. explain why carbon monoxide (co) is or is not an element.
3. explain are all compounds molecules? why or why not?
4. compare van der waals forces, ionic bonds, and covalent bonds.

think critically

1. explain how the number of electrons in an energy level affects bond formation.

math in biology

1. beryllium has four protons in its nucleus. how many neutrons are in beryllium-9? explain how you calculated your answer.

Explanation:

For question 6 (MATH in Biology: Beryllium - 9 neutron calculation)

Step1: Recall atomic mass formula

The atomic mass ($A$) of an atom is given by the sum of the number of protons ($p$) and neutrons ($n$) in its nucleus, i.e., $A = p + n$.

Step2: Identify known values

For beryllium - 9, the atomic mass $A = 9$ (from the isotope notation beryllium - 9) and the number of protons $p = 4$ (given in the problem).

Step3: Solve for number of neutrons

Rearrange the formula $A = p + n$ to solve for $n$: $n=A - p$. Substitute $A = 9$ and $p = 4$ into the formula: $n = 9-4=5$.

Answer:

The number of neutrons in beryllium - 9 is 5. The calculation is done using the formula for atomic mass ($A=p + n$), where $A = 9$ (atomic mass of beryllium - 9) and $p = 4$ (number of protons). Rearranging to find neutrons gives $n=A - p=9 - 4 = 5$.