13. fill in the following chart for each element or isotope
element name symbol isotope symbol atomic # mass # # of protons # of neutrons # of electrons
hydrogen h
sodium na 1 1
1 2
k
bromine 11 9
c - 14
u - 234
calcium 13

Question

Accepted Answer

# Explanation:
## Step1: Recall atomic number and basic facts
The atomic number of an element is equal to the number of protons. For a neutral atom, the number of electrons is equal to the number of protons. The mass - number is the sum of protons and neutrons.
## Step2: Hydrogen
Hydrogen has atomic number 1. Common isotope is $^1H$. Mass number = 1, protons = 1, neutrons = 0, electrons = 1.
## Step3: Sodium
Sodium has atomic number 11. Common isotope is $^{23}Na$. Mass number = 23, protons = 11, neutrons = 23 - 11=12, electrons = 11.
## Step4: Potassium
Potassium has atomic number 19. A common isotope is $^{39}K$. Mass number = 39, protons = 19, neutrons = 39 - 19 = 20, electrons = 19.
## Step5: Bromine
Bromine has atomic number 35. A common isotope is $^{79}Br$. Mass number = 79, protons = 35, neutrons = 79 - 35 = 44, electrons = 35.
## Step6: Carbon - 14 ($C - 14$)
Carbon has atomic number 6. For $C - 14$, mass number = 14, protons = 6, neutrons = 14 - 6 = 8, electrons = 6.
## Step7: Uranium - 234 ($U - 234$)
Uranium has atomic number 92. For $U - 234$, mass number = 234, protons = 92, neutrons = 234 - 92 = 142, electrons = 92.
## Step8: Calcium
Calcium has atomic number 20. A common isotope is $^{40}Ca$. Mass number = 40, protons = 20, neutrons = 40 - 20 = 20, electrons = 20.

| Element Name | Symbol | Isotope Symbol | Atomic # | Mass # | # of Protons | # of Neutrons | # of Electrons |
| ---- | ---- | ---- | ---- | ---- | ---- | ---- | ---- |
| Hydrogen | H | $^1H$ | 1 | 1 | 1 | 0 | 1 |
| Sodium | Na | $^{23}Na$ | 11 | 23 | 11 | 12 | 11 |
| Potassium | K | $^{39}K$ | 19 | 39 | 19 | 20 | 19 |
| Bromine | Br | $^{79}Br$ | 35 | 79 | 35 | 44 | 35 |
| Carbon | C | $^{14}C$ | 6 | 14 | 6 | 8 | 6 |
| Uranium | U | $^{234}U$ | 92 | 234 | 92 | 142 | 92 |
| Calcium | Ca | $^{40}Ca$ | 20 | 40 | 20 | 20 | 20 |

# Answer:
| Element Name | Symbol | Isotope Symbol | Atomic # | Mass # | # of Protons | # of Neutrons | # of Electrons |
| ---- | ---- | ---- | ---- | ---- | ---- | ---- | ---- |
| Hydrogen | H | $^1H$ | 1 | 1 | 1 | 0 | 1 |
| Sodium | Na | $^{23}Na$ | 11 | 23 | 11 | 12 | 11 |
| Potassium | K | $^{39}K$ | 19 | 39 | 19 | 20 | 19 |
| Bromine | Br | $^{79}Br$ | 35 | 79 | 35 | 44 | 35 |
| Carbon | C | $^{14}C$ | 6 | 14 | 6 | 8 | 6 |
| Uranium | U | $^{234}U$ | 92 | 234 | 92 | 142 | 92 |
| Calcium | Ca | $^{40}Ca$ | 20 | 40 | 20 | 20 | 20 |

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Question

Explanation:

Step1: Recall atomic number and basic facts

Step2: Hydrogen

Step3: Sodium

Step4: Potassium

Step5: Bromine

Step6: Carbon - 14 (\(C - 14\))

Step7: Uranium - 234 (\(U - 234\))

Step8: Calcium

Answer:

Element Name	Symbol	Isotope Symbol	Atomic #	Mass #	# of Protons	# of Neutrons	# of Electrons
Sodium	Na	\(^{23}Na\)	11	23	11	12	11
Potassium	K	\(^{39}K\)	19	39	19	20	19
Bromine	Br	\(^{79}Br\)	35	79	35	44	35
Carbon	C	\(^{14}C\)	6	14	6	8	6
Uranium	U	\(^{234}U\)	92	234	92	142	92
Calcium	Ca	\(^{40}Ca\)	20	40	20	20	20