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Question
english ii
work: james’s chapter seminar prep
udent - led seminar on james’s chapter. on - time
vipation. this assignment is due thursday. be
name: _______________________ teacher: _____________
q1 chemistry: u2l1 the atom & subatomic particles date: _______________
prepwork part 2: the atomic symbol
directions: analyze the examples below on how to write the atomic symbol for a neutral atom and an ion.
then answer the following questions.
part 1: analyze the examples:
atomic symbol
example
$\ce{^{12}_{6}c}$
element: carbon
protons: 6 (atomic number)
mass number: 12
electrons: 6 (in a neutral atom)
find the number of neutrons
mass number – number of protons = number of neutrons
$\therefore 12 – 6 = 6$ neutrons
atomic symbol with a charge
mass number: 24 (12 protons + 12 neutrons)
$\ce{^{24}_{12}mg^{2+}}$
charge = number of protons – number of electrons
charge: 2+ (12 protons – 10 electrons)
atomic number: 12 (12 protons)
chemical element: mg (magnesium)
part 2: identify the missing components using the examples above. hint! you fill in the blanks in any order. use the information to determine which one you can identify/calculate first.
| atomic symbol | element name | mass number | protons | neutrons | electrons | charge |
|---|---|---|---|---|---|---|
| $\ce{^{7}_{3}li^{+}}$ | ||||||
| $\ce{^{16}_{8}o^{2-}}$ |
For $\boldsymbol{_3^7Li}$ (neutral atom)
Step1: Identify Element Name
The atomic symbol is $Li$, so the element name is Lithium.
Step2: Determine Mass Number
From the symbol $_3^7Li$, the mass number (top number) is $7$.
Step3: Determine Protons
The atomic number (bottom number) is $3$, so protons = $3$ (atomic number = number of protons).
Step4: Calculate Neutrons
Using the formula: Mass number - Protons = Neutrons. So $7 - 3 = 4$ neutrons.
Step5: Determine Electrons (Neutral Atom)
In a neutral atom, electrons = protons, so electrons = $3$.
Step6: Determine Charge (Neutral Atom)
Charge = Protons - Electrons = $3 - 3 = 0$ (neutral).
For $\boldsymbol{_3^7Li^+}$ (ion)
Step1: Element Name
Same as above, Lithium.
Step2: Mass Number
From the symbol, mass number is $7$.
Step3: Protons
Atomic number is $3$, so protons = $3$.
Step4: Neutrons
$7 - 3 = 4$ (same as neutral atom, since mass number and protons don't change for an ion of the same isotope).
Step5: Determine Electrons (Ion)
Charge = Protons - Electrons. Given charge is $+1$, so $1 = 3 -$ Electrons $\implies$ Electrons = $3 - 1 = 2$.
Step6: Charge
Given as $+1$ (from the symbol $Li^+$).
For $\boldsymbol{_8^{16}O^{2-}}$ (ion)
Step1: Element Name
The atomic symbol is $O$, so element name is Oxygen.
Step2: Mass Number
From the symbol $_8^{16}O^{2-}$, the mass number is $16$.
Step3: Protons
Atomic number is $8$, so protons = $8$.
Step4: Calculate Neutrons
Mass number - Protons = Neutrons $\implies 16 - 8 = 8$ neutrons.
Step5: Determine Electrons (Ion)
Charge = Protons - Electrons. Given charge is $2-$, so $-2 = 8 -$ Electrons $\implies$ Electrons = $8 + 2 = 10$.
Step6: Charge
Given as $2-$ (from the symbol $O^{2-}$).
Filled Table:
| Atomic Symbol | Element Name | Mass Number | Protons | Neutrons | Electrons | Charge |
|---|---|---|---|---|---|---|
| $_3^7Li^+$ | Lithium | 7 | 3 | 4 | 2 | $+1$ |
| $_8^{16}O^{2-}$ | Oxygen | 16 | 8 | 8 | 10 | $2-$ |
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Step1: Identify Element Name
The atomic symbol is $Li$, so the element name is Lithium.
Step2: Determine Mass Number
From the symbol $_3^7Li$, the mass number (top number) is $7$.
Step3: Determine Protons
The atomic number (bottom number) is $3$, so protons = $3$ (atomic number = number of protons).
Step4: Calculate Neutrons
Using the formula: Mass number - Protons = Neutrons. So $7 - 3 = 4$ neutrons.
Step5: Determine Electrons (Neutral Atom)
In a neutral atom, electrons = protons, so electrons = $3$.
Step6: Determine Charge (Neutral Atom)
Charge = Protons - Electrons = $3 - 3 = 0$ (neutral).
For $\boldsymbol{_3^7Li^+}$ (ion)
Step1: Element Name
Same as above, Lithium.
Step2: Mass Number
From the symbol, mass number is $7$.
Step3: Protons
Atomic number is $3$, so protons = $3$.
Step4: Neutrons
$7 - 3 = 4$ (same as neutral atom, since mass number and protons don't change for an ion of the same isotope).
Step5: Determine Electrons (Ion)
Charge = Protons - Electrons. Given charge is $+1$, so $1 = 3 -$ Electrons $\implies$ Electrons = $3 - 1 = 2$.
Step6: Charge
Given as $+1$ (from the symbol $Li^+$).
For $\boldsymbol{_8^{16}O^{2-}}$ (ion)
Step1: Element Name
The atomic symbol is $O$, so element name is Oxygen.
Step2: Mass Number
From the symbol $_8^{16}O^{2-}$, the mass number is $16$.
Step3: Protons
Atomic number is $8$, so protons = $8$.
Step4: Calculate Neutrons
Mass number - Protons = Neutrons $\implies 16 - 8 = 8$ neutrons.
Step5: Determine Electrons (Ion)
Charge = Protons - Electrons. Given charge is $2-$, so $-2 = 8 -$ Electrons $\implies$ Electrons = $8 + 2 = 10$.
Step6: Charge
Given as $2-$ (from the symbol $O^{2-}$).
Filled Table:
| Atomic Symbol | Element Name | Mass Number | Protons | Neutrons | Electrons | Charge |
|---|---|---|---|---|---|---|
| $_3^7Li^+$ | Lithium | 7 | 3 | 4 | 2 | $+1$ |
| $_8^{16}O^{2-}$ | Oxygen | 16 | 8 | 8 | 10 | $2-$ |