Question

1. the element helium (he) exists in the form of two stable isotopes: helium - 3 and helium - 4.

in the diagrams below, draw the two isotopes of helium. include all protons, neutrons, and electrons.

1. the element lithium (li) exists in the form of two stable isotopes: lithium - 6 and lithium - 7.

in the diagrams below, draw the two isotopes of lithium. include all protons, neutrons, and electrons.

Explanation:

Step1: Determine the number of protons

The atomic number of lithium is \(3\). So, both isotopes (Lithium - 6 and Lithium - 7) have \(3\) protons (\(p^{+}=3\)).

Step2: Determine the number of electrons

For a neutral atom, the number of electrons equals the number of protons. So, both isotopes have \(3\) electrons (\(e^{-}=3\)).

Step3: Determine the number of neutrons

• For Lithium - 6: The mass number \(A = 6\). Using the formula \(A=p^{+}+n^{0}\), we get \(n^{0}=A - p^{+}=6 - 3=3\).
• For Lithium - 7: The mass number \(A = 7\). Using the formula \(A=p^{+}+n^{0}\), we get \(n^{0}=A - p^{+}=7 - 3=4\).

Answer:

• Lithium - 6: \(3\) protons, \(3\) electrons, \(3\) neutrons.
• Lithium - 7: \(3\) protons, \(3\) electrons, \(4\) neutrons.