Question

phet -building an atom
part i: atom screen

1. go to the website: phet.colorado.edu. build an atom https://phet.colorado.edu/sims/html/build - an - atom/latest/build - an - atom_en.html
2. click on the + sign for each of the boxes (element name, net charge and mass number) to view changes as you change the number of particles in the atom.
3. what particle(s) are found in the center of the atom?
4. which particle(s) determine(s) the name of the element you build.
5. what is the name of the following atoms?

a. an atom with 3 protons and 4 neutrons:
b. an atom with 2 protons and 4 neutrons:
c. an atom with 4 protons and 4 neutrons:

1. play with the simulation. which particles affect the charge of an atom or ion?
2. fill in the blanks below to show your results:

a. neutral atoms have (same number or different number ) of protons and electron
b. positive ions have (more or less ) protons than electrons.
c. negative ions have (more or less )protons than electrons.

1. develop a relationship (in the form of a single sentence or equation) that can predict the charge based on the number and types of particle.

protons > electron = ㊉
proton < electron = ㊀
proton = electron : neutral

1. play with the simulation to discover what affects the mass number of your atom or ion. what is a rule for determining the mass number of an atom or ion?
2. practice applying your understanding by playing 1st and 2nd levels on the game screen.

get a signature here from your teacher after earning at least 8 stars on level 1 and 2.
signature

Explanation:

Step1: Recall atomic - structure basics

Protons and neutrons are in the nucleus (center of the atom).

Step2: Recall element - defining particle

The number of protons determines the element name.

Step3: Identify elements by proton number

a. Lithium (3 protons).
b. Helium (2 protons).
c. Beryllium (4 protons).

Step4: Determine charge - affecting particles

Protons and electrons affect the charge. Protons are positive, electrons are negative.

Step5: Fill in blanks about atom/ion charge

a. Neutral atoms have the same number of protons and electrons.
b. Positive ions have more protons than electrons.
c. Negative ions have less protons than electrons.

Step6: Formulate charge - prediction relationship

Charge = Number of protons - Number of electrons.

Step7: Determine mass - number factors

The mass number is the sum of protons and neutrons.

Answer:

1. Protons and neutrons
2. Protons
3. a. Lithium

b. Helium
c. Beryllium

1. Protons and electrons
2. a. same number

b. more
c. less

1. Charge = Number of protons - Number of electrons
2. Mass number = Number of protons + Number of neutrons