name wendy ponce, sept,10 period 2 phet -building an atom part 1 and 2 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: 6. play with the simulation. which particles affect the charge of an atom or ion? 7. fill in the blanks below to show your results: a. neutral atoms have (same number or different number) of protons and electrons. b. positive ions have (more or less) protons than electrons. c. negative ions have (more or less)protons than electrons. 8. 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 = ⊕ proton

Question

name wendy ponce, sept,10 period 2 phet -building an atom part 1 and 2 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: 6. play with the simulation. which particles affect the charge of an atom or ion? 7. fill in the blanks below to show your results: a. neutral atoms have (same number or different number) of protons and electrons. b. positive ions have (more or less) protons than electrons. c. negative ions have (more or less)protons than electrons. 8. 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 = ⊕ proton < electron = ⊖ proton =electron ;neutral 9. 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? 10. 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 from level 1 and 2. signature

Accepted Answer

### Question 3
# Brief Explanations:
In an atom, the center (nucleus) contains protons and neutrons. Protons have a positive charge, neutrons have no charge, and they are densely packed in the nucleus.
# Answer:
Protons and neutrons

### Question 4
# Brief Explanations:
The number of protons (atomic number) determines the element. Each element has a unique number of protons. For example, hydrogen has 1 proton, helium has 2 protons, etc.
# Answer:
Protons (or the number of protons)

### Question 5
#### a.
# Brief Explanations:
The number of protons determines the element (atomic number = 3, so lithium). Mass number = protons + neutrons = 3 + 4 = 7, so lithium - 7.
# Answer:
Lithium (or Lithium - 7)

#### b.
# Brief Explanations:
Atomic number (protons) = 2, so helium. Mass number = 2 + 4 = 6, so helium - 6.
# Answer:
Helium (or Helium - 6)

#### c.
# Brief Explanations:
Atomic number (protons) = 4, so beryllium. Mass number = 4 + 4 = 8, so beryllium - 8.
# Answer:
Beryllium (or Beryllium - 8)

### Question 6
# Brief Explanations:
Protons are positive, electrons are negative. The charge is determined by the difference between protons and electrons. Neutrons have no charge, so they don't affect charge.
# Answer:
Protons and electrons

### Question 7
#### a.
# Brief Explanations:
In a neutral atom, the positive charge of protons equals the negative charge of electrons, so the number of protons and electrons is the same.
# Answer:
same number

#### b.
# Brief Explanations:
A positive ion has lost electrons (or has more protons than electrons), so positive ions have more protons than electrons.
# Answer:
more

#### c.
# Brief Explanations:
A negative ion has gained electrons (or has fewer protons than electrons), so negative ions have less protons than electrons.
# Answer:
less

### Question 8
# Brief Explanations:
The charge of an atom or ion is calculated as the number of protons minus the number of electrons ($ \text{Charge} = p - e $, where $ p $ is protons and $ e $ is electrons). If $ p = e $, charge is 0 (neutral); if $ p > e $, positive; if $ p < e $, negative.
# Answer:
The charge of an atom or ion is equal to the number of protons minus the number of electrons (or $ \text{Charge} = \text{Number of Protons} - \text{Number of Electrons} $)

### Question 9
# Brief Explanations:
Mass number is the sum of protons and neutrons in the nucleus. Electrons have negligible mass, so they don't contribute to the mass number.
# Answer:
The mass number of an atom or ion is the sum of the number of protons and the number of neutrons (or $ \text{Mass Number} = \text{Number of Protons} + \text{Number of Neutrons} $)

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