Question

question 21 (1 point)
number of neutrons in c^{14} is
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question 22 (1 point)
the halogen in the third period is
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Explanation:

Question 21

Step1: Recall neutron formula

Neutrons = Mass number - Atomic number. For carbon, atomic number (Z) is 6, mass number (A) of \( C^{14} \) is 14.

Step2: Calculate neutrons

Neutrons = \( 14 - 6 = 8 \).

Step1: Recall halogen group

Halogens are group 17 elements. Period number = principal quantum number (n) of valence shell.

Step2: Find third period halogen

Third period has n = 3. Group 17, n = 3: element is chlorine (Cl), atomic number 17, electron configuration \( 2, 8, 7 \), so valence shell n = 3.

Answer:

8

Question 22