Atomic Structure

​Atomic Structure

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Multiple Choice

DIRECTIONS: Drag a proton into the atom model (x with two dashed circles around it). Click on "Net Charge" to see if what you have made has a charge or not. Next, click on "Mass Number" to find out the atom's atomic mass.

QUESTION: What happens when you drop the proton into the model?

• It forms the element hydrogen which has a positive charge and an atomic mass of 1.

• Nothing

• It forms the element hydrogen which has a negative charge and no mass.

• It forms the element hydrogen which has a neutral (no) charge and atomic mass of 1.

Multiple Select

DIRECTIONS: Add an electron to your atom of hydrogen.

QUESTION: What happens to the atom? Select all that apply.

• It becomes a new element (not hydrogen anymore)

• It remains hydrogen.

• Its charge stays the same.

• Its charge increases to +2.

• Its charge decreases to 0.

Multiple Choice

DIRECTIONS: Add a neutron to your model from the previous question.

QUESTION: What happens to the element when you add a neutron?

• Nothing changes.

• The charges do not change, but the atomic mass does.

• The charges and mass number change.

• The charges change, but the atomic mass does not.

Dropdown

DIRECTIONS: Select the best answers from the dropdowns to fill in the blanks and complete the statement.

QUESTION: Adding a proton​ (a)​ ​

Select answer

the charge, meaning that protons have a​ (b) ​

Select answer

charge. Adding a neutron​ has no effect on the charge, meaning that neutrons have a​ (c)​ ​

Select answer

charge. Adding an electron​ (d)​ ​

Select answer

the charge, meaning that electrons have a​ (e)​ ​

Select answer

charge.

Dropdown

DIRECTIONS: Based on your observations from when you added protons, neutrons, and electrons to the model, complete the statement below.

QUESTION: ​ Both protons and neutrons​ (a)​ ​

Select answer

the mass by​ (b)​ ​

Select answer

. Adding an electron​ (c)​ ​

Select answer

change the mass. This is because its mass is so small it is ignored. In terms of their individual mass, protons are​ (d)​ ​

Select answer

to neutrons and both are​ (e)​ ​

Select answer

electrons.

Multiple Choice

DIRECTIONS: Add another proton to your model and check what happens.

QUESTION: Which of the following best describes what changes?

• Just the charge changes.

• Just the mass changes.

• The mass and the charge change, but nothing else.

• The mass, the charge, and the name of the atom change.

Multiple Choice

QUESTION: Based on your observations so far, which subatomic particle determines what element an atom is (its name)?

• Proton
• Neutron
• Electron

• Nucleus

Multiple Choice

Neutral atoms have...

• more protons than electrons

• less protons than electrons

• the same number of protons and electrons

Multiple Select

What particles affect the mass of the atom? (Select all that apply)

• Protons

• Neutrons

• Electrons

Dropdown

​

Select answer

determine the element symbol and the atomic number of an element. ​​

Select answer

determine the charge of the element. ​​

Select answer

determine the mass of the element.