Question

complete the table; the first two rows have been done for you. use your periodic table to complete the rest.

element	symbol	protons	neutrons	electrons
carbon	c	6	12 - 6 = 6	6
sodium	na	11		11
aluminum	al	13		13
lead	pb	82		82
titanium	ti	22		22
zinc	zn	30		30
mercury	hg	80		80
chlorine	cl	17		17
tungsten	w	74		74

Explanation:

Step1: Recall atomic number property

The number of protons is equal to the atomic number of the element. The number of electrons in a neutral atom is equal to the number of protons. To find the number of neutrons, we use the formula: Number of neutrons = Mass - number of protons (for common - isotopes, we can use the rounded - off mass number from the periodic table).

Step2: For Sodium (Na)

Atomic number of Na is 11. So, number of protons = 11, number of electrons = 11. The most common isotope of sodium has a mass number of 23. So, number of neutrons = 23 - 11=12.

Step3: For Aluminum (Al)

Atomic number of Al is 13. So, number of protons = 13, number of electrons = 13. The most common isotope of aluminum has a mass number of 27. So, number of neutrons = 27 - 13 = 14.

Step4: For Lead (Pb)

Atomic number of Pb is 82. So, number of protons = 82, number of electrons = 82. The most common isotope of lead has a mass number of 207. So, number of neutrons = 207 - 82 = 125.

Step5: For Titanium (Ti)

Atomic number of Ti is 22. So, number of protons = 22, number of electrons = 22. The most common isotope of titanium has a mass number of 48. So, number of neutrons = 48 - 22 = 26.

Step6: For Zinc (Zn)

Atomic number of Zn is 30. So, number of protons = 30, number of electrons = 30. The most common isotope of zinc has a mass number of 65. So, number of neutrons = 65 - 30 = 35.

Step7: For Mercury (Hg)

Atomic number of Hg is 80. So, number of protons = 80, number of electrons = 80. The most common isotope of mercury has a mass number of 200. So, number of neutrons = 200 - 80 = 120.

Step8: For Chlorine (Cl)

Atomic number of Cl is 17. So, number of protons = 17, number of electrons = 17. The most common isotope of chlorine has a mass number of 35. So, number of neutrons = 35 - 17 = 18.

Step9: For Tungsten (W)

Atomic number of W is 74. So, number of protons = 74, number of electrons = 74. The most common isotope of tungsten has a mass number of 184. So, number of neutrons = 184 - 74 = 110.

Element	Symbol	Protons	Neutrons	Electrons
Aluminum	Al	13	14	13
Lead	Pb	82	125	82
Titanium	Ti	22	26	22
Zinc	Zn	30	35	30
Mercury	Hg	80	120	80
Chlorine	Cl	17	18	17
Tungsten	W	74	110	74

Answer:

Element	Symbol	Protons	Neutrons	Electrons
Aluminum	Al	13	14	13
Lead	Pb	82	125	82
Titanium	Ti	22	26	22
Zinc	Zn	30	35	30
Mercury	Hg	80	120	80
Chlorine	Cl	17	18	17
Tungsten	W	74	110	74