Question

atomic structure worksheet
list the 3 subatomic particles, their charges, masses and where in the atom they are located in the chart below.
describe how to determine the number of each subatomic particle in an atom below.
proton:
electron:
neutron:
fill in the chart for the elements below. round all atomic masses to the nearest whole number.
element symbol (z) atomic number (a) atomic mass # of protons # of electrons # of neutrons
sodium na 11 22.990 11 11 12
copper cu 29 63.546 29 29
chlorine cl 17 35. 17
silver ag 47 107.868
pb 82 207.2
calcium ca 20 40.078
hafnium hf 72 178.49
radon
93 52
uranium
potassium

Explanation:

Step1: Identify sub - atomic particle properties

Proton: charge = + 1, mass ≈ 1 amu, located in nucleus.
Electron: charge=-1, mass ≈ 0 amu, located in electron - cloud around nucleus.
Neutron: charge = 0, mass ≈ 1 amu, located in nucleus.

Step2: Determine number of sub - atomic particles

• Proton: The number of protons is equal to the atomic number (Z) of the element.
• Electron: In a neutral atom, the number of electrons is equal to the number of protons.
• Neutron: Number of neutrons = Atomic mass (A) (rounded to nearest whole number)-Atomic number (Z).

Step3: Fill in the chart for elements

• Sodium (Na): Z = 11, A≈23. Protons = 11, Electrons = 11, Neutrons=23 - 11 = 12.
• Copper (Cu): Z = 29, A≈64. Protons = 29, Electrons = 29, Neutrons=64 - 29 = 35.
• Chlorine (Cl): Z = 17, A≈35. Protons = 17, Electrons = 17, Neutrons=35 - 17 = 18.
• Silver (Ag): Z = 47, A≈108. Protons = 47, Electrons = 47, Neutrons=108 - 47 = 61.
• Lead (Pb): Z = 82, A≈207. Protons = 82, Electrons = 82, Neutrons=207 - 82 = 125.
• Calcium (Ca): Z = 20, A≈40. Protons = 20, Electrons = 20, Neutrons=40 - 20 = 20.
• Hafnium (Hf): Z = 72, A≈179. Protons = 72, Electrons = 72, Neutrons=179 - 72 = 107.
• Radon (Rn): Assume some values. If we consider a common isotope, for example, if Z = 86 and we need more information about the specific isotope for accurate A value. But if we assume a typical A value around 222, Protons = 86, Electrons = 86, Neutrons=222 - 86 = 136.
• Uranium (U): Z = 92, for example, for U - 238 isotope, A = 238. Protons = 92, Electrons = 92, Neutrons=238 - 92 = 146.
• Potassium (K): Z = 19, A≈39. Protons = 19, Electrons = 19, Neutrons=39 - 19 = 20.

Answer:

Element	Symbol	Atomic Number (Z)	Atomic Mass (A) (rounded)	# of Protons	# of Electrons	# of Neutrons
Copper	Cu	29	64	29	29	35
Chlorine	Cl	17	35	17	17	18
Silver	Ag	47	108	47	47	61
Lead	Pb	82	207	82	82	125
Calcium	Ca	20	40	20	20	20
Hafnium	Hf	72	179	72	72	107
Radon	Rn	86	222 (assumed)	86	86	136
Uranium	U	92	238 (assumed for U - 238)	92	92	146
Potassium	K	19	39	19	19	20