Atom and Electron Configuration Essay

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Name: ______________________________________ Date: ________________________

Student Exploration: Electron Configuration

Vocabulary: atomic number, atomic radius, Aufbau principle, chemical family, diagonal rule, electron configuration, Hund’s rule, orbital, Pauli exclusion principle, period, shell, spin, subshell

Prior Knowledge Questions (Do these BEFORE using the Gizmo.)

1. Elvis Perkins, a rather shy fellow, is getting on the bus shown at right. Which seat do you think he will probably sit in? Mark this seat with an “E.”

2. Marta Warren gets on the bus after Elvis. She is tired after a long day at work. Where do you think she will sit? Mark this seat with an “M.”

3. In your experience, do strangers getting on a bus like to
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Apply: Atoms are most stable when their outermost shell is full. If their outermost shell is not full, atoms tend to gain, lose, or share electrons until the shell fills up. While doing this, atoms react and form chemical bonds with other atoms.

Based on this, what can you infer about the reactivity of helium and neon? They are both noble gases so they are very resistant to a chemical reaction and don’t react to other elements.

11. Think and discuss: Select the PERIODIC TABLE tab, and look at the second row, or period, of the table. How does this row reflect the subshells of the second shell?

The second period on the periodic table consists of elements that are filling the 2nd energy level.
Activity B:

Atomic radii
Get the Gizmo ready:
On the PERIODIC TABLE tab, select Na (sodium).

Question: How do the radii of atoms change across a period of the periodic table?

1. Predict: Positively charged protons in the nucleus of an atom are attracted to negatively charged electrons.

How do you think the atomic radii will change as electrons are added to a shell?

As more electrons are added the distance will increase which cause atomic radius to change.

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