Worksheet number 4 Name_____________________________ ...

160 downloads 5048 Views 311KB Size Report
Click on the first link “PhET: Free online….” Click the orange “Play with sims” button. Scroll halfway down on that page and click the “Build an atom” simulation.
Worksheet number 4

Name_____________________________ Hour__________

Building an atom simulation & practice Finding the simulation: Google “PhET”. Click on the first link “PhET: Free online….” Click the orange “Play with sims” button. Scroll halfway down on that page and click the “Build an atom” simulation. Click the green “Run now!” button. OR click this link and click the green “Run now!” button: http://phet.colorado.edu/en/simulation/build-an-atom Directions: 1. Add 1 proton to the nucleus of the atom. Look to the periodic table on the right. What element is highlighted?_______________________ 2. Notice in the upper right hand corner of the atom it says +1 ion. Why is this called and “ion”? ___________ ______________________________________ Why does it have a +1 charge? __________________________ 3. Add one electron. Is it still an ion? ________Why or why not?______________________________________ 4. Add one neutron. What is the proton:neutron ratio?___________ Is the atom stable? _________ Add a second neutron. What is the proton: neutron ratio now? _____________ Is the atom stable? _____________ 5. Click on the green “+” signs for symbol, mass number, and charge on the right. 6. Draw the symbol for the atom you have now. Label the atomic number, mass number, symbol and charge. 7. What does the mass number say? ________ 8. Add one proton and one electron. Is this still a hydrogen atom? ___________If not, what is it? _______________________________________________________ 9. What does the mass number say now? _______________How is the mass number calculated? ___________ ________________________________________________ 10. The electrons on the first ring are spaced out. Why do you think this is? ________________________________ 11. Add 4 more protons (so you have a total of six). How many electrons do you need for a neutral atom? __________ How many electrons were on the first ring before it started filling the second ring? ___________ 12. How many neutrons do we need to make this element stable? ____________ or _____________ 13. Draw the symbol for both of these below. These two boxes represent __________________ of the element carbon because they have different numbers of neutrons.

14. Take away one proton. Are you left with an atom or an ion? _______________ Why? ___________________ ___________________________________________ What is the charge? __________

15. Add one electron. What is the charge now? __________________ 16. Make a stable Beryllium ion with a +2 charge. How many protons did you need? ____________ How many neutrons? ______________ How many electrons? _______________ Draw the symbol for the Beryllium ion.

Big ideas: 

The number of (protons/neutrons/electrons) __________________ determines the identity of the an atom



In order to create an ion, we gain or lose (protons/neutrons/electrons) __________________



Isotopes are atoms of the same element with different numbers of ____________________(protons/neutrons/electrons)



When atoms gain electrons they become _______________ (positive/negative) ions. These are called ANIONS.



When atoms lose electrons they become _______________ (positive/negative) ions. These are called CATIONS.



What determines whether an atom/ion is stable or not?

Practice: 

Play the games. Call Ms. Haggerty over to initial your scores for each round. If you are absent, just write in your own scores.

Level 1: ______/10

Symbol

Mass number

Level 2: ______/10

Atomic number

Number of protons

Level 3: ______/10

Number of neutrons

K FSr2+ Au3+

Number of electrons

Level 4: ______/10

Net charge

Written

10

3+ 15 56

16

26

0 77

119

3-

50

53

2+

46

For the “written” column: All isotopes can be written as element name—mass number. For example: be written as “Oxygen-16”.

O can also