Question

1. the atomic number of an atom is equal to the number of ____________. 5. the mass number is equal to the ___________________. 6. fill in the table below. nuclear symbol atom - mass name atomic # mass protons neutrons electrons (_{35}^{80}br) (_{11}^{23}na) (_{10}^{20}ne) isotopes 7. isotopes of the same element have the same numbers of ____________ and __________. 8. isotopes of the same element have a different number of __________ and therefore a different ____________. 9. fill in the nuclear symbol and the rest of the chart for the following isotopes. nuclear symbol atom - mass name atomic # mass protons neutrons electrons chlorine - 34 chlorine - 35 chlorine - 36

Explanation:

Step1: Recall atomic number def.

Atomic number = number of protons

Step2: Recall mass - number def.

Mass number = protons + neutrons

Step3: For $^{80}_{35}Br$

Atomic # = 35, Mass = 80, Protons = 35, Neutrons = 80 - 35=45, Electrons = 35

Step4: For $^{23}_{11}Na$

Atomic # = 11, Mass = 23, Protons = 11, Neutrons = 23 - 11 = 12, Electrons = 11

Step5: For $^{20}_{10}Ne$

Atomic # = 10, Mass = 20, Protons = 10, Neutrons = 20 - 10 = 10, Electrons = 10

Step6: Isotopes

Same protons and electrons. Different neutrons and mass - number

Step7: For Chlorine isotopes

Chlorine atomic # = 17. For $^{34}_{17}Cl$: Mass = 34, Protons = 17, Neutrons = 34 - 17 = 17, Electrons = 17. For $^{35}_{17}Cl$: Mass = 35, Protons = 17, Neutrons = 35 - 17 = 18, Electrons = 17. For $^{36}_{17}Cl$: Mass = 36, Protons = 17, Neutrons = 36 - 17 = 19, Electrons = 17

Answer:

1. Protons
2. Sum of protons and neutrons

6.

Nuclear Symbol	Atom - Mass Name	Atomic #	Mass	Protons	Neutrons	Electrons
$^{23}_{11}Na$	-	11	23	11	12	11
$^{20}_{10}Ne$	-	10	20	10	10	10

1. Protons, Electrons
2. Neutrons, Mass - number

9.

Nuclear Symbol	Atom - Mass Name	Atomic #	Mass	Protons	Neutrons	Electrons
$^{35}_{17}Cl$	Chlorine - 35	17	35	17	18	17
$^{36}_{17}Cl$	Chlorine - 36	17	36	17	19	17