Question

question 5: standard c.pm.2
how many protons are in magnesium?
a. 12
b. 13
c. 14
d. 15
question 6: standard c.pm.2
how many electrons are in magnesium?
a. 11
b. 12
c. 13
d. 14
question 7: standard c.pm.2
how many neutrons are in magnesium? (hint: use the atomic mass of 24 to find your ans
a. 12
b. 13
c. 14
d. 15
question 8: standard c.pm.2
which of these is the bohr model for magnesium?
a.
b.
c.
d.

Explanation:

Question 5

Step1: Recall atomic number - proton relation

The atomic number of an element equals the number of protons. Magnesium has an atomic number of 12. So, the number of protons in Magnesium is 12.

Step1: Recall neutral atom electron - proton relation

In a neutral atom, the number of electrons equals the number of protons. From Question 5, Magnesium has 12 protons, so it has 12 electrons.

Step1: Recall atomic mass - proton - neutron relation

The formula for the number of neutrons is $ \text{Number of neutrons} = \text{Atomic mass} - \text{Atomic number} $. The atomic mass of Magnesium is given as 24, and the atomic number (from Question 5) is 12.

Step2: Calculate neutrons

Substitute the values: $ 24 - 12 = 12 $. Wait, but wait, the actual atomic mass of Magnesium is approximately 24.305, but the hint says to use 24. Wait, maybe there's a typo, but following the hint: $ 24 - 12 = 12 $? But the options have 12,13,14,15. Wait, maybe the atomic mass is 24, and atomic number 12, so neutrons = 24 - 12 = 12? But option a is 12. Wait, but maybe the actual atomic mass is 24, and atomic number 12, so neutrons = 24 - 12 = 12. But let's check again. Wait, Magnesium's atomic number is 12, atomic mass is approximately 24.3, so neutrons are about 12.3, which is rounded to 12 or 13? Wait, the hint says use atomic mass of 24. So 24 - 12 = 12. So the answer should be a. 12? Wait, but maybe I made a mistake. Wait, no, the atomic number is 12 (protons), atomic mass is 24 (sum of protons and neutrons), so neutrons = 24 - 12 = 12. So answer is a. 12.

Answer:

a. 12

Question 6