Question

protons, neutrons, and electrons, based on the given atomic mass.
remember: atomic number = number of protons=number of electrons
atomic mass - atomic number = neutrons

element	symbol	group number (1-18)	protons	neutrons	electrons	mass number
chlorine						35 amu
iron						56 amu
rubidium						85 amu
neon						20 amu
bromine						80 amu
fluorine						40 amu
potassium						39 amu
strontium						88 amu
radium						222 amu
magnesium						24 amu
gold						197 amu

Explanation:

Step1: Recall Element Details

For each element, recall atomic number (protons = electrons), then calculate neutrons (mass - atomic number).

Chlorine (Cl)

• Atomic number = 17 (protons = 17, electrons = 17)
• Neutrons = \( 35 - 17 = 18 \)
• Group: 17 (or 7A, but group number 1 - 18: 17)

Iron (Fe)

• Atomic number = 26 (protons = 26, electrons = 26)
• Neutrons = \( 56 - 26 = 30 \)
• Group: 8

Rubidium (Rb)

• Atomic number = 37 (protons = 37, electrons = 37)
• Neutrons = \( 85 - 37 = 48 \)
• Group: 1

Neon (Ne)

• Atomic number = 10 (protons = 10, electrons = 10)
• Neutrons = \( 20 - 10 = 10 \)
• Group: 18

Bromine (Br)

• Atomic number = 35 (protons = 35, electrons = 35)
• Neutrons = \( 80 - 35 = 45 \)
• Group: 17

Fluorine (F)

• Atomic number = 9 (protons = 9, electrons = 9)
• Neutrons = \( 40 - 9 = 31 \) (Note: Actual mass ~19, but using given 40)
• Group: 17

Potassium (K)

• Atomic number = 19 (protons = 19, electrons = 19)
• Neutrons = \( 39 - 19 = 20 \)
• Group: 1

Strontium (Sr)

• Atomic number = 38 (protons = 38, electrons = 38)
• Neutrons = \( 88 - 38 = 50 \)
• Group: 2

Radium (Ra)

• Atomic number = 88 (protons = 88, electrons = 88)
• Neutrons = \( 222 - 88 = 134 \)
• Group: 2

Magnesium (Mg)

• Atomic number = 12 (protons = 12, electrons = 12)
• Neutrons = \( 24 - 12 = 12 \)
• Group: 2

Gold (Au)

• Atomic number = 79 (protons = 79, electrons = 79)
• Neutrons = \( 197 - 79 = 118 \)
• Group: 11

Step2: Fill the Table

Element	Symbol	Group Number	Protons	Neutrons	Electrons	Mass number
Chlorine	Cl	17	17	\( 35 - 17 = 18 \)	17	35 amu
Iron	Fe	8	26	\( 56 - 26 = 30 \)	26	56 amu
Rubidium	Rb	1	37	\( 85 - 37 = 48 \)	37	85 amu
Neon	Ne	18	10	\( 20 - 10 = 10 \)	10	20 amu
Bromine	Br	17	35	\( 80 - 35 = 45 \)	35	80 amu
Fluorine	F	17	9	\( 40 - 9 = 31 \)	9	40 amu
Potassium	K	1	19	\( 39 - 19 = 20 \)	19	39 amu
Strontium	Sr	2	38	\( 88 - 38 = 50 \)	38	88 amu
Radium	Ra	2	88	\( 222 - 88 = 134 \)	88	222 amu
Magnesium	Mg	2	12	\( 24 - 12 = 12 \)	12	24 amu
Gold	Au	11	79	\( 197 - 79 = 118 \)	79	197 amu

Answer:

The table is filled as shown above, with each element's symbol, group number, protons, neutrons (calculated as mass - protons), electrons (equal to protons), and mass number.