Question

group d: atoms extension

1. go to phet: build an atom. (https://phet.colorado.edu/) explore the different

activities you can do.

1. as you explore, figure out what it means to say that an atom is an ion. once you

figure it out, write an explanation of what an ion is below.
a. an ion is:

1. next, pay attention to the label \stable/unstable.\ what makes an atom stable or

unstable? write an explanation here:

Explanation:

Part 2a:

To determine what an ion is, we can use the "Build an Atom" simulation on PhET. In the simulation, we can observe the number of protons (positive charge) and electrons (negative charge) in an atom. A neutral atom has an equal number of protons and electrons. When an atom gains or loses electrons, the balance between positive and negative charges is disrupted. If an atom loses electrons, it will have more protons than electrons, resulting in a positive charge. If it gains electrons, it will have more electrons than protons, resulting in a negative charge. This charged particle is called an ion. So, an ion is an atom (or a group of atoms) that has a net electric charge because it has lost or gained one or more electrons.

Part 3:

In the "Build an Atom" simulation, the "stable/unstable" label is related to the atom's electron configuration, specifically the outermost (valence) shell. An atom is stable when its outermost electron shell is full. For most atoms, the outermost shell is stable when it has 8 electrons (the octet rule), except for the first shell, which is stable with 2 electrons (the duet rule for hydrogen and helium). If the outermost shell is not full, the atom is unstable and will tend to gain, lose, or share electrons to achieve a full outer shell. Additionally, the ratio of neutrons to protons in the nucleus can also affect stability, especially for larger atoms. Atoms with a "stable" ratio of neutrons to protons (close to 1 for light elements, increasing slightly for heavier elements) are more stable, while those with a ratio too far from this range may be unstable and undergo radioactive decay.

Answer:

2a. An ion is:

An atom (or a group of atoms) that has a net electric charge due to the loss or gain of one or more electrons.

3. What makes an atom stable or unstable?

An atom is stable when its outermost electron shell is full (follows the octet/duet rule for electron configuration) and has a stable neutron - proton ratio in the nucleus. An atom is unstable if its outermost electron shell is not full (making it reactive to gain/lose/share electrons) or has an unstable neutron - proton ratio (leading to radioactive decay).