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.
Question 1
1.
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.
Question 2
2.
How many energy levels does H have?
Question 3
3.
What is the atomic radius of H? (in pm)
Question 4
4.
How many energy levels does Li have?
Question 5
5.
What is the atomic radius of Li? (in pm)
Question 6
6.
How many energy levels does Na have?
Question 7
7.
What is the atomic radius of Na? (in pm)
Question 8
8.
How many energy levels does K have?
Question 9
9.
What is the atomic radius of K? (in pm)
Question 10
10.
Based on question 6 - 13, What happens to the radius as you move down group 1?
Question 11
11.
Based on question 6 - 13, based on the number of energy, explain your answer to question 14.
Question 12
12.
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.
Question 13
13.
How many energy levels does Na have?
Question 14
14.
Based on it's atomic number, how many protons does Na have?
Question 15
15.
What is the radius of Na? (in pm)
Question 16
16.
How many energy levels does Mg have?
Question 17
17.
Based on it's atomic number, how many protons does Mg have?
Question 18
18.
What is the atomic radius of Mg?
Question 19
19.
How many energy levels does Si have?
Question 20
20.
How many protons does Si have?
Question 21
21.
What is the atomic radius of Si? (pm)
Question 22
22.
Based on answers 17-25, what happens to the radius as you move across a period?
Question 23
23.
Based on answers 17-25, as you move across a period, are new energy levels added?
Question 24
24.
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?
Question 25
25.
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?
Question 26
26.
How does your answer to the previous question explain the trend in radii across a period?
