Question

name: __________ teacher: __________
q1 chemistry: u2l1 the atom & subatomic particles date: ____________
prepwork part 1: the atom & subatomic particle practice

1. what is the overall charge of an ion that has 15 protons, 18 electrons, and 17 neutrons?

a. +1 c. +3
b. -1 d. -3

1. what is the mass number of the ion in q1?

a. 32 c. 35
b. 33 d. 50

1. what is the overall charge of an ion that has 6 protons, 8 electrons, and 8 neutrons?

a. +2 c. 0
b. -2 d. -1

1. what is the mass number of the ion in q3?

a. 12 c. 16
b. 14 d. 22

Explanation:

Question 1

Step1: Recall charge formula

Charge = Protons - Electrons

Step2: Substitute values

Protons = 15, Electrons = 18
Charge = \( 15 - 18 = -3 \)? Wait, no, wait: Wait, protons are positive, electrons negative. So charge is (number of protons) - (number of electrons). Wait 15 - 18 = -3? Wait no, wait the options: a +1, b -1, c +3, d -3. Wait maybe I miscalculated. Wait 15 protons (each +1), 18 electrons (each -1). So total charge: \( 15(+1) + 18(-1) = 15 - 18 = -3 \)? But option d is -3. Wait but let me check again. Wait 15 protons, 18 electrons: 15 positive, 18 negative. So net charge: 15 - 18 = -3. So answer d? Wait no, wait maybe I made a mistake. Wait the options: a +1, b -1, c +3, d -3. Wait 15 protons, 18 electrons: 15 - 18 = -3. So d. But let's check question 2.

Question 2

Step1: Recall mass number formula

Mass number = Protons + Neutrons

Step2: Substitute values (from Q1: 15 protons, 17 neutrons)

Mass number = \( 15 + 17 = 32 \)? Wait 15 +17=32, option a. Wait but Q1's ion: 15 protons, 18 electrons, 17 neutrons. So mass number is 15 +17=32. So option a.

Question 3

Step1: Recall charge formula

Charge = Protons - Electrons

Step2: Substitute values (6 protons, 8 electrons)

Charge = \( 6 - 8 = -2 \). So option b.

Question 4

Answer:

s:

1. d. -3
2. a. 32
3. b. -2
4. b. 14