Question

fill in the isotopes
element | symbol | atomic number | atomic mass | number of electrons | number of protons | number of neutrons
neon | ne | 10 | 21 | 10 | 10 | 11
krypton | kr | 18 | 36 | 18 | 18 | 18
radon | rn | | 86 | | 36 |

		109			62
		74	32
	120	50
		50			28

Explanation:

To solve for the missing values in the isotopes table, we use the following relationships:

• Atomic number (Z) = Number of protons = Number of electrons (in neutral atoms).
• Atomic mass (A) = Number of protons + Number of neutrons (A = Z + N ⇒ N = A - Z).

Step 1: Neon (Ne)

• Atomic number (Z) = 10 ⇒ Protons = 10, Electrons = 10.
• Neutrons (N) = Atomic mass - Atomic number = \( 21 - 10 = 11 \).

Step 2: Krypton (Kr)

• Atomic number (Z) = 18 ⇒ Protons = 18, Electrons = 18.
• Neutrons (N) = \( 36 - 18 = 18 \).

Step 3: Radon (Rn)

• Protons = 36 ⇒ Atomic number (Z) = 36, Electrons = 36.
• Neutrons (N) = \( 86 - 36 = 50 \).

Step 4: Element with A = 109, N = 62

• Atomic number (Z) = A - N = \( 109 - 62 = 47 \) (Silver, Ag).
• Protons = 47, Electrons = 47.

Step 5: Element with A = 74, Electrons = 32

• Electrons = 32 ⇒ Protons = 32, Atomic number (Z) = 32 (Germanium, Ge).
• Neutrons (N) = \( 74 - 32 = 42 \).

Step 6: Element with Z = 120, A = 50 (Incorrect, likely typo: A should be > Z. Assume A = 120, Z = 50? No—Z=120 is too high. Correcting: Z=50 (Tin, Sn), A=120.

• Protons = 50, Electrons = 50.
• Neutrons (N) = \( 120 - 50 = 70 \).

Step 7: Element with A = 50, N = 28

• Atomic number (Z) = A - N = \( 50 - 28 = 22 \) (Titanium, Ti).
• Protons = 22, Electrons = 22.

Final Table (Key Values):

Element	Symbol	Z	A	Electrons	Protons	Neutrons
Krypton	Kr	18	36	18	18	18
Radon	Rn	36	86	36	36	50
Silver	Ag	47	109	47	47	62
Germanium	Ge	32	74	32	32	42
Tin	Sn	50	120	50	50	70
Titanium	Ti	22	50	22	22	28

Answer:

The table is filled using atomic structure relationships (Z = protons = electrons, A = Z + N). Key calculations include \( N = A - Z \) and \( Z = A - N \).