Question

atomic structure worksheet
fill in the blanks for the elements in this chart. for the purposes of this chart,
round all atomic masses to the nearest whole number.

element	number of protons	number of neutrons	number of electrons	atomic mass	atomic number
carbon
chlorine
silver
lead
calcium
tantalum
radium
samarium
uranium
americium
lawrencium

Answer:

To solve the atomic structure worksheet, we use the following concepts:

• Atomic Number (Z) = Number of Protons = Number of Electrons (in a neutral atom).
• Atomic Mass (A) ≈ Number of Protons + Number of Neutrons.
• Number of Neutrons = Atomic Mass − Atomic Number.

Step 1: Recall Atomic Numbers (Z) and Atomic Masses (A) from the periodic table

We first list the atomic number (Z) and average atomic mass (A, rounded to the nearest whole number) for each element:

Element	Atomic Number (Z)	Atomic Mass (A)
Carbon	6	12
Chlorine	17	35
Silver	47	108
Lead	82	207
Calcium	20	40
Tantalum	73	181
Radium	88	226
Selenium	34	79	(Note: "Semanium" is likely a typo for "Selenium")
Uranium	92	238
Americium	95	243
Lawrencium	103	262

Step 2: Calculate Protons, Neutrons, and Electrons

For each element:

• Protons = Atomic Number (Z).
• Electrons = Protons (neutral atom).
• Neutrons = Atomic Mass (A) − Atomic Number (Z).

Example: Lithium

• Protons: \( 3 \) (Z = 3)
• Electrons: \( 3 \) (neutral)
• Neutrons: \( 7 - 3 = 4 \)
• Atomic Mass: \( 7 \)
• Atomic Number: \( 3 \)

Example: Carbon

• Protons: \( 6 \) (Z = 6)
• Electrons: \( 6 \) (neutral)
• Neutrons: \( 12 - 6 = 6 \)
• Atomic Mass: \( 12 \)
• Atomic Number: \( 6 \)

Example: Chlorine

• Protons: \( 17 \) (Z = 17)
• Electrons: \( 17 \) (neutral)
• Neutrons: \( 35 - 17 = 18 \)
• Atomic Mass: \( 35 \)
• Atomic Number: \( 17 \)

Example: Silver

• Protons: \( 47 \) (Z = 47)
• Electrons: \( 47 \) (neutral)
• Neutrons: \( 108 - 47 = 61 \)
• Atomic Mass: \( 108 \)
• Atomic Number: \( 47 \)

Example: Lead

• Protons: \( 82 \) (Z = 82)
• Electrons: \( 82 \) (neutral)
• Neutrons: \( 207 - 82 = 125 \)
• Atomic Mass: \( 207 \)
• Atomic Number: \( 82 \)

Example: Calcium

• Protons: \( 20 \) (Z = 20)
• Electrons: \( 20 \) (neutral)
• Neutrons: \( 40 - 20 = 20 \)
• Atomic Mass: \( 40 \)
• Atomic Number: \( 20 \)

Example: Tantalum

• Protons: \( 73 \) (Z = 73)
• Electrons: \( 73 \) (neutral)
• Neutrons: \( 181 - 73 = 108 \)
• Atomic Mass: \( 181 \)
• Atomic Number: \( 73 \)

Example: Radium

• Protons: \( 88 \) (Z = 88)
• Electrons: \( 88 \) (neutral)
• Neutrons: \( 226 - 88 = 138 \)
• Atomic Mass: \( 226 \)
• Atomic Number: \( 88 \)

Example: Selenium (Semanium)

• Protons: \( 34 \) (Z = 34)
• Electrons: \( 34 \) (neutral)
• Neutrons: \( 79 - 34 = 45 \)
• Atomic Mass: \( 79 \)
• Atomic Number: \( 34 \)

Example: Uranium

• Protons: \( 92 \) (Z = 92)
• Electrons: \( 92 \) (neutral)
• Neutrons: \( 238 - 92 = 146 \)
• Atomic Mass: \( 238 \)
• Atomic Number: \( 92 \)

Example: Americium

• Protons: \( 95 \) (Z = 95)
• Electrons: \( 95 \) (neutral)
• Neutrons: \( 243 - 95 = 148 \)
• Atomic Mass: \( 243 \)
• Atomic Number: \( 95 \)

Example: Lawrencium

• Protons: \( 103 \) (Z = 103)
• Electrons: \( 103 \) (neutral)
• Neutrons: \( 262 - 103 = 159 \)
• Atomic Mass: \( 262 \)
• Atomic Number: \( 103 \)

Final Table (Filled)

Element	Number of Protons	Number of Neutrons	Number of Electrons	Atomic Mass	Atomic Number
Carbon	6	6	6	12	6
Chlorine	17	18	17	35	17
Silver	47	61	47	108	47
Lead	82	125	82	207	82
Calcium	20	20	20	40	20
Tantalum	73	108	73	181	73
Radium	88	138	88	226	88
Selenium	34	45	34	79	34
Uranium	92	146	92	238	92
Americium	95	148	95	243	95
Lawrencium	103	159	103	262	103

(Note: If "Semanium" was intended to be a different element, adjust using its correct atomic number and mass.)