Isotopes: Gizmo Lab
Activity A:
Isotope notation
Get the Gizmo ready:
Set protons to 2 and neutrons to 2.
Check that Show isotope notation is selected.
Question: How are isotopes written down?
1. Explore: Below the helium atom you see the isotope notation for helium-4. Add and
subtr...
Get the Gizmo ready:
Activity A:
Set protons to 2 and neutrons to 2.
Isotope notation
Check that Show isotope notation is selected.
Question: How are isotopes written down?
1. Explore: Below the helium atom you see the isotope notation for helium-4. Add and
subtract protons and neutrons a few times using the arrow buttons. Notice how the isotope
notation changes when you do this.
A. What does the top number equal? Mass Number
m
er as
B. Which particle determines the atomic number? Atomic Number
co
eH w
In isotope notation there are two numbers to the left of the element
symbol. The top number is the mass number (A). The mass number
o.
is the sum of the protons and neutrons. The bottom number is the
rs e
atomic number (Z). The atomic number is the number of protons.
ou urc
2. Apply: Turn off Show isotope notation. Set protons to 3 and neutrons to 4.
o
aC s
Write this isotope using isotope notation. Check your answer in the Gizmo.
7
vi y re
3Li
ed d
ar stu
3. Observe: Set the protons to 8 and the neutrons to 9.
A. How is the isotope written at the top left of the gray box?
Oxygen – 17: Stable
is
This isotope makes up 0.38% of the element.
Th
B. What does the number next to the element name indicate? Mass
sh
4. Practice: Turn off Show isotope notation. Use what you have learned to fill in the table.
When you are finished, check your answers in the Gizmo.
Protons Neutrons Mass number Isotope notation Symbol
17 18 35 Chlorine-35 Cl
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2018
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