part 1: atom screen
1. which particle(s) are found in the center of the atom?
2. which particle(s) are found on the outside of the atom?
3. build the following atoms and type the name of each element you built.
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;
4. which particle(s) determine the name of the element you build?
directions: click on the green (+) button next to
et charge\. play with the simulation to discover which particles affect the charge of an atom or ion. then fill in the blanks below.
5. ions are just atoms with a net charge. fill in the blanks below to show your understanding of net charges:
a. positive ions have protons than electrons.
b. negative ions have protons than electrons.
c. neutral ions have protons and electrons.
directions: click on the green (+) button next to \mass number\. play with the simulation to discover which particles affect the mass of an atom.
6. how is the mass of an atom calculated?

Question

part 1: atom screen
1. which particle(s) are found in the center of the atom?
2. which particle(s) are found on the outside of the atom?
3. build the following atoms and type the name of each element you built.
   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;
4. which particle(s) determine the name of the element you build?
directions: click on the green (+) button next to
et charge\. play with the simulation to discover which particles affect the charge of an atom or ion. then fill in the blanks below.
5. ions are just atoms with a net charge. fill in the blanks below to show your understanding of net charges:
   a. positive ions have  protons than electrons.
   b. negative ions have  protons than electrons.
   c. neutral ions have  protons and electrons.
directions: click on the green (+) button next to \mass number\. play with the simulation to discover which particles affect the mass of an atom.
6. how is the mass of an atom calculated?

Accepted Answer

### Question 1
# Brief Explanations:
In an atom, the center (nucleus) contains protons (positively charged) and neutrons (neutral). Electrons are outside. So protons and neutrons are in the nucleus (center).
# Answer:
Protons and neutrons

### Question 2
# Brief Explanations:
Electrons are negatively charged particles that orbit the nucleus in electron clouds or shells, which are outside the atomic nucleus.
# Answer:
Electrons

### Question 3
#### a
# Brief Explanations:
The number of protons determines the element (atomic number = 3). Element with 3 protons is lithium. Neutrons add to mass but not identity. So 3 protons → lithium.
# Answer:
Lithium

#### b
# Brief Explanations:
2 protons mean atomic number 2, which is helium. Neutrons (4) affect mass, but protons determine the element. So 2 protons → helium.
# Answer:
Helium

#### c
# Brief Explanations:
4 protons mean atomic number 4, which is beryllium. Neutrons (4) are part of the mass, but protons define the element. So 4 protons → beryllium.
# Answer:
Beryllium

### Question 4
# Brief Explanations:
The number of protons (atomic number) uniquely identifies an element. Each element has a specific number of protons, so protons determine the element's name.
# Answer:
Protons

### Question 5
#### a
# Brief Explanations:
Positive ions (cations) form when an atom loses electrons. So they have more protons (positive charge) than electrons (negative charge), resulting in a net positive charge.
# Answer:
more

#### b
# Brief Explanations:
Negative ions (anions) form when an atom gains electrons. So they have fewer protons (positive charge) than electrons (negative charge), leading to a net negative charge.
# Answer:
fewer

#### c
# Brief Explanations:
Neutral atoms (or ions, though neutral ions are just neutral atoms) have an equal number of protons (positive) and electrons (negative), so their charges cancel out.
# Answer:
an equal number of

### Question 6
# Brief Explanations:
The mass of an atom (atomic mass, approximately mass number) is the sum of the masses of protons and neutrons in the nucleus (electrons have negligible mass). So mass = number of protons + number of neutrons.
# Answer:
The mass of an atom is calculated by adding the number of protons and the number of neutrons (since electrons have negligible mass).

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