Question

protons, neutrons, and electrons worksheet

atomic symbol	atomic number	protons	neutrons	electrons	atomic mass	charge
		34			79	0
	24			21
			10	9		0
	41			35	93
p	15					-3
rb					85	+1
		46			106	0
	76		114	72
	19				39	0
mo				36	96
		106		106	265
	87				223	0
				78
hg				54	131	0

Explanation:

Step1: Recall core atomic rules

1. Atomic number = Protons = Electrons (neutral atom)
2. Neutrons = Atomic mass - Protons
3. Charge = Protons - Electrons
4. Atomic symbol matches atomic number (periodic table)

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Row 1 (Pb):

Step1: Fill atomic number

Atomic number = Protons = 82

Step2: Calculate electrons

Electrons = Protons - Charge = $82 - 2 = 80$

Step3: Calculate neutrons

Neutrons = Atomic mass - Protons = $207 - 82 = 125$

Step4: Confirm atomic mass

Atomic mass = 207 (standard for Pb-207)

---

Row 2:

Step1: Identify atomic symbol

Atomic number = Protons = 34 → Se (Selenium)

Step2: Calculate neutrons

Neutrons = Atomic mass - Protons = $79 - 34 = 45$

Step3: Confirm electrons

Electrons = Protons (charge 0) = 34

---

Row 3:

Step1: Fill protons

Protons = Atomic number = 24

Step2: Calculate charge

Charge = Protons - Electrons = $24 - 21 = +3$

Step3: Calculate atomic mass

Atomic mass = Protons + Neutrons (assume neutral standard: 24+28=52)

Step4: Identify atomic symbol

Atomic number 24 → Cr (Chromium)

---

Row 4:

Step1: Calculate protons

Protons = Electrons + Charge = $9 + 0 = 9$

Step2: Fill atomic number

Atomic number = Protons = 9

Step3: Calculate atomic mass

Atomic mass = Protons + Neutrons = $9 + 10 = 19$

Step4: Identify atomic symbol

Atomic number 9 → F (Fluorine)

---

Row 5:

Step1: Fill protons

Protons = Atomic number = 41

Step2: Calculate charge

Charge = Protons - Electrons = $41 - 35 = +6$

Step3: Calculate neutrons

Neutrons = Atomic mass - Protons = $93 - 41 = 52$

Step4: Identify atomic symbol

Atomic number 41 → Nb (Niobium)

---

Row 6 (P):

Step1: Fill protons

Protons = Atomic number = 15

Step2: Calculate electrons

Electrons = Protons - Charge = $15 - (-3) = 18$

Step3: Calculate atomic mass

Atomic mass = Protons + Neutrons (standard: 15+16=31)

Step4: Calculate neutrons

Neutrons = 31 - 15 = 16

---

Row 7 (Rb):

Step1: Fill atomic number

Atomic number for Rb = 37

Step2: Fill protons

Protons = Atomic number = 37

Step3: Calculate electrons

Electrons = Protons - Charge = $37 - 1 = 36$

Step4: Calculate neutrons

Neutrons = Atomic mass - Protons = $85 - 37 = 48$

---

Row 8:

Step1: Fill atomic number

Atomic number = Protons = 46

Step2: Calculate neutrons

Neutrons = Atomic mass - Protons = $106 - 46 = 60$

Step3: Confirm electrons

Electrons = Protons (charge 0) = 46

Step4: Identify atomic symbol

Atomic number 46 → Pd (Palladium)

---

Row 9:

Step1: Fill protons

Protons = Atomic number = 76

Step2: Calculate charge

Charge = Protons - Electrons = $76 - 72 = +4$

Step3: Calculate atomic mass

Atomic mass = Protons + Neutrons = $76 + 114 = 190$

Step4: Identify atomic symbol

Atomic number 76 → Os (Osmium)

---

Row 10:

Step1: Fill protons

Protons = Atomic number = 19

Step2: Fill electrons

Electrons = Protons (charge 0) = 19

Step3: Calculate neutrons

Neutrons = Atomic mass - Protons = $39 - 19 = 20$

Step4: Identify atomic symbol

Atomic number 19 → K (Potassium)

---

Row 11 (Mo):

Step1: Fill atomic number

Atomic number for Mo = 42

Step2: Fill protons

Protons = Atomic number = 42

Step3: Calculate charge

Charge = Protons - Electrons = $42 - 36 = +6$

Step4: Calculate neutrons

Neutrons = Atomic mass - Protons = $96 - 42 = 54$

---

Row 12:

Step1: Fill atomic number

Atomic number = Protons = 106

Step2: Calculate charge

Charge = Protons - Electrons = $106 - 106 = 0$

Step3: Calculate neutrons

Neutrons = Atomic mass - Protons = $265 - 106 = 159$

Step4: Identify atomic symbol

Atomic number 106 → Sg (Seaborgium)

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Row 13:

Step1: Fill protons

Protons = Atomic number = 87

Step2: Fill electrons

Electrons = Protons (charge 0) = 87

Step3: Calculate neutrons

Neutrons = Atomic mass - Protons = $223 - 87 = 136$

Step4: Identify atomic symbol

Atomic number 87 → Fr (Francium)

---

Row 14 (Hg):

Step1: Fill atomic number

Atomic number for Hg = 80

Step2: Fill protons

Protons = Atomic number = 80

Step3: Calculate charge

Charge = Protons - Electrons = $80 - 78 = +2$

Step4: Calculate atomic mass

Atomic mass (standard) = 200.6 ≈ 201; Neutrons = $201 - 80 = 121$

---

Row 15:

Step1: Calculate protons

Protons = Electrons + Charge = $54 + 0 = 54$

Step2: Fill atomic number

Atomic number = Protons = 54

Step3: Calculate neutrons

Neutrons = Atomic mass - Protons = $131 - 54 = 77$

Step4: Identify atomic symbol

Atomic number 54 → Xe (Xenon)

Answer:

Atomic symbol	Atomic number	Protons	Neutrons	Electrons	Atomic mass	Charge
Se	34	34	45	34	79	0
Cr	24	24	28	21	52	+3
F	9	9	10	9	19	0
Nb	41	41	52	35	93	+6
P	15	15	16	18	31	-3
Rb	37	37	48	36	85	+1
Pd	46	46	60	46	106	0
Os	76	76	114	72	190	+4
K	19	19	20	19	39	0
Mo	42	42	54	36	96	+6
Sg	106	106	159	106	265	0
Fr	87	87	136	87	223	0
Hg	80	80	121	78	201	+2
Xe	54	54	77	54	131	0