Question

part iv: review exercises

1. the periodic table has a great deal of information about every atom. using your periodic table, answer the following questions:

a. what is the atomic number of chlorine (cl)? ____
b. how many protons are there in any cl atom? ____
c. what is the atomic number of tungsten (w)? ____

1. complete the following table. assume the atoms are neutral.

name	symbol	atomic number	mass number	number of neutrons	number of electrons
	$^{3}h$
		12	24		12
		12	25
	$^{107}ag$
carbon - 12					6
carbon - 13					6
carbon - 14					6
	$^{4}he$
		8		8
argon - 40		18			18

Explanation:

Step1: Find chlorine in periodic table

Chlorine (Cl) has atomic number 17.

Step2: Recall proton - atomic number relation

For any atom, number of protons = atomic number. So Cl has 17 protons.

Step3: Find tungsten in periodic table

Tungsten (W) has atomic number 74.

Step4: Fill hydrogen - 3 row

Hydrogen - 3 has symbol $^{3}H$. Atomic number of hydrogen is 1. Mass number is 3. Number of neutrons = mass number - atomic number = 3 - 1 = 2. Number of electrons in neutral atom = atomic number = 1.

Step5: Fill magnesium rows

For atomic number 12 (magnesium), mass number 24, number of neutrons = 24 - 12 = 12. For mass number 25, number of neutrons = 25 - 12 = 13. Number of electrons in neutral magnesium = 12.

Step6: Fill silver row

For $^{107}Ag$, atomic number of silver is 47. Mass number is 107. Number of neutrons = 107 - 47 = 60. Number of electrons in neutral silver = 47.

Step7: Fill carbon rows

For carbon - 12, atomic number is 6, mass number is 12, number of neutrons = 12 - 6 = 6. For carbon - 13, mass number is 13, number of neutrons = 13 - 6 = 7. For carbon - 14, mass number is 14, number of neutrons = 14 - 6 = 8.

Step8: Fill helium row

For $^{4}He$, atomic number is 2, mass number is 4, number of neutrons = 4 - 2 = 2, number of electrons = 2.

Step9: Fill oxygen - like row

If atomic number is 8, mass number = number of neutrons+atomic number = 8 + 8 = 16.

Step10: Fill argon row

For argon - 40 with atomic number 18, mass number is 40, number of neutrons = 40 - 18 = 22.

Answer:

1.
A. 17
B. 17
C. 74
2.

Name	Symbol	Atomic number	Mass Number	Number of neutrons	Number of Electrons
hydrogen - 3	$^{3}H$	1	3	2	1
magnesium		12	24	12	12
magnesium		12	25	13	12
silver	$^{107}Ag$	47	107	60	47
carbon - 12		6	12	6	6
carbon - 13		6	13	7	6
carbon - 14		6	14	8	6
helium	$^{4}He$	2	4	2	2
oxygen - like		8	16	8	8
argon - 40		18	40	22	18