Question

1. magnesiums atomic number is 12 and its mass number is 24. magnesium has protons, electrons, and neutrons. 2. what determines the chemical properties of an element? atomic number number of electron shells number of valence electrons physical state at room temperature

Explanation:

Step1: Determine the number of protons

The atomic number of an element is equal to the number of protons. Given that magnesium's atomic number is 12, so the number of protons is 12.

Step2: Determine the number of electrons

In a neutral atom, the number of electrons is equal to the number of protons. Since the number of protons is 12, the number of electrons is also 12.

Step3: Determine the number of neutrons

The mass number of an atom is the sum of the number of protons and neutrons. We know that mass number \(A = 24\) and number of protons \(Z=12\). Using the formula \(A=Z + N\) (where \(N\) is the number of neutrons), we can solve for \(N\): \(N=A - Z\). Substituting the values, we get \(N = 24- 12=12\).

Answer:

Protons: 12, Electrons: 12, Neutrons: 12