Question

element | symbol | atomic number | mass number | # of protons | # of neutrons | # of electrons | charge
hydrogen | | | | | 2 | | 0

	19	39				0
$^{13}$c

chlorine | | | | | | | 0

$^{200}$au$^{2+}$
				8	10
			15	17		2+

mercury | | | 202 | | | | 3-

$^{20}$ne
				28	28

zinc | | | | | | |

$^{110}$ag$^+$

Explanation:

Step1: Recall key atomic rules

1. Atomic Number = # of Protons = # of Electrons (neutral atom)
2. Mass Number = # of Protons + # of Neutrons
3. Charge = # of Protons - # of Electrons
4. Isotope notation: $^A_Z X^{c+}$, where $A$=Mass #, $Z$=Atomic #, $c$=charge

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Row 1 (Hydrogen, charge=0, neutrons=2)

Step1: Find protons (neutral atom)

Charge=0, so #Protons=#Electrons. Hydrogen has atomic number 1, so #Protons=1

Step2: Calculate mass number

$\text{Mass Number} = 1 + 2 = 3$

Step3: Fill remaining values

Symbol: $^3\text{H}$, Atomic #=1, #Electrons=1

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Row 2 (Atomic #=19, Mass #=39, charge=0)

Step1: Identify element & protons

Atomic #=19 = #Protons, element is Potassium (K)

Step2: Calculate neutrons

$\text{#Neutrons} = 39 - 19 = 20$

Step3: Find electrons (neutral)

#Electrons=#Protons=19

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Row 3 ($^{13}\text{C}$)

Step1: Get atomic/mass numbers

Atomic # of C=6, Mass #=13, #Protons=6

Step2: Calculate neutrons

$\text{#Neutrons} = 13 - 6 = 7$

Step3: Find electrons (neutral)

Charge=0, so #Electrons=6, Element=Carbon

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Row 4 (Chlorine, charge=0)

Step1: Get atomic number

Chlorine atomic #=17 = #Protons=#Electrons

Step2: Use most common mass #

Most common isotope is $^{35}\text{Cl}$, so Mass #=35

Step3: Calculate neutrons

$\text{#Neutrons} = 35 - 17 = 18$

Step4: Fill symbol

Symbol: $\text{Cl}$

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Row 5 ($^{200}\text{Au}^{2+}$)

Step1: Get atomic/mass numbers

Au atomic #=79 = #Protons, Mass #=200

Step2: Calculate neutrons

$\text{#Neutrons} = 200 - 79 = 121$

Step3: Find electrons (2+ charge)

$\text{#Electrons} = 79 - 2 = 77$

Step4: Identify element & charge

Element=Gold, Charge=2+

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Row 6 (#Neutrons=8, #Electrons=10)

Step1: Find charge

Assume neutral atomic #=8 (Oxygen), $\text{Charge} = 8 - 10 = 2-$

Step2: Calculate mass number

$\text{Mass Number} = 8 + 8 = 16$

Step3: Fill values

Element=Oxygen, Symbol: $^{16}\text{O}^{2-}$, Atomic #=8, #Protons=8

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Row 7 (#Protons=15, #Neutrons=17, charge=2+)

Step1: Identify element

#Protons=15 = atomic #, element=Phosphorus (P)

Step2: Calculate mass number

$\text{Mass Number} = 15 + 17 = 32$

Step3: Find electrons

$\text{#Electrons} = 15 - 2 = 13$

Step4: Fill symbol

Symbol: $^{32}\text{P}^{2+}$, Atomic #=15

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Row 8 (Mercury, Mass #=202, charge=3-)

Step1: Get atomic number

Hg atomic #=80 = #Protons

Step2: Calculate neutrons

$\text{#Neutrons} = 202 - 80 = 122$

Step3: Find electrons

$\text{#Electrons} = 80 + 3 = 83$

Step4: Fill symbol

Symbol: $^{202}\text{Hg}^{3-}$

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Row 9 ($^{20}\text{Ne}$)

Step1: Get atomic number

Ne atomic #=10 = #Protons

Step2: Calculate neutrons

$\text{#Neutrons} = 20 - 10 = 10$

Step3: Find electrons (neutral)

#Electrons=10, Charge=0, Element=Neon

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Row 10 (#Neutrons=28, #Electrons=28)

Step1: Assume neutral atom

#Protons=#Electrons=28, element=Nickel (Ni)

Step2: Calculate mass number

$\text{Mass Number} = 28 + 28 = 56$

Step3: Fill values

Atomic #=28, Charge=0, Symbol: $^{56}\text{Ni}$

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Row 11 (Zinc)

Step1: Get atomic number

Zn atomic #=30 = #Protons

Step2: Use most common mass #

Most common isotope $^{65}\text{Zn}$, Mass #=65

Step3: Calculate neutrons

$\text{#Neutrons} = 65 - 30 = 35$

Step4: Fill values (neutral)

#Electrons=30, Charge=0, Symbol: $^{65}\text{Zn}$

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Row 12 ($^{110}\text{Ag}^{+}$)

Step1: Get atomic number

Ag atomic #=47 = #Protons

Step2: Calculate neutrons

$\text{#Neutrons} = 110 - 47 = 63$

Step3: Find electrons (1+ charge)

$\text{#Electrons} = 47 - 1 = 46$

Step4: Fill values

Element…

Answer:

Element	Symbol	Atomic Number	Mass Number	# of Protons	# of Neutrons	# of Electrons	Charge
Potassium	$\text{K}$	19	39	19	20	19	0
Carbon	$^{13}\text{C}$	6	13	6	7	6	0
Chlorine	$\text{Cl}$	17	35	17	18	17	0
Gold	$^{200}\text{Au}^{2+}$	79	200	79	121	77	2+
Oxygen	$^{16}\text{O}^{2-}$	8	16	8	8	10	2-
Phosphorus	$^{32}\text{P}^{2+}$	15	32	15	17	13	2+
Mercury	$^{202}\text{Hg}^{3-}$	80	202	80	122	83	3-
Neon	$^{20}\text{Ne}$	10	20	10	10	10	0
Nickel	$^{56}\text{Ni}$	28	56	28	28	28	0
Zinc	$^{65}\text{Zn}$	30	65	30	35	30	0
Silver	$^{110}\text{Ag}^{+}$	47	110	47	63	46	1+