Assignment 21: Periodic Trends - Katie Braymiller | Laabri

Exploration: In this simulation we will be looking at the radius of atoms on the periodic table. The radius of an atom is similar to the radius of a circle; it is from the nucleus of atom to the outside ring, just as seen in the image below.

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Predict: How do you think the radius of an atom will change as you move down a group (vertical column) in the periodic table? Do you think it will be bigger or smaller and why?

A. Open gizmos, login and click periodic trends.

Reminder:

Username: KateScience

Password:

Gian use: gf58

Sanaaiyah use: sl92

B. Click on show ruler.

C. Collect data: Use the ruler to measure the atomic radius of the group 1 elements, by moving the red circles of the ruler onto the atom. As you do so, count the energy levels (shown as rings of electrons) in each atom.

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How many energy levels does H have?

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What is the atomic radius of H? (in pm)

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How many energy levels does Li have?

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What is the atomic radius of Li? (in pm)

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How many energy levels does Na have?

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What is the atomic radius of Na? (in pm)

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How many energy levels does K have?

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What is the atomic radius of K? (in pm)

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Based on question 6 - 13, What happens to the radius as you move down group 1?

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Based on question 6 - 13, based on the number of energy, explain your answer to question 14.

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Predict: How do you think the radius of an atom will change as you move across a period (horizontal row) in the periodic table?

Collect data: Use the ruler to measure the atomic radius of the period 1 elements, by moving the red circles of the ruler onto the atom. As you do so, count the energy levels (shown as rings of electrons) in each atom. Record in the table.

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How many energy levels does Na have?

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Based on it's atomic number, how many protons does Na have?

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What is the radius of Na? (in pm)

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How many energy levels does Mg have?

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Based on it's atomic number, how many protons does Mg have?

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What is the atomic radius of Mg?

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How many energy levels does Si have?

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How many protons does Si have?

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What is the atomic radius of Si? (pm)

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Based on answers 17-25, what happens to the radius as you move across a period?

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Based on answers 17-25, as you move across a period, are new energy levels added?

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Based on answers 17-25, what happens to the number of protons in the nucleus as you move from one element to the next across a period?

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Remember that opposite charges (positive and negative) attract, as you go across the period and add more protons and electrons, will it attract more or less?

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How does your answer to the previous question explain the trend in radii across a period?

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