Given the diagram below, match the following questions with the correct answer choice.

Question

Atom: 12 protons, 12 neutrons, 12 electrons.

What is the mass number of this atom? (Hint: mass number = protons + neutrons)

What is the atomic number of this atom? (Hint: How many protons does it have?)


How many energy levels does this atom have?

How many valence electrons does this atom have?

What group in the periodic table is this atom in? (Hint: how many valence electrons does it have?)

What period of the periodic table is it in? (Hint: how many energy levels does it have?)

Choices: 2A, 2, 12, 24, 3

choose the correct answer

Answer 1

Let's analyze the information provided for the atom with 12 protons, 12 neutrons, and 12 electrons.

1. Mass Number: Mass number = protons + neutrons = 12 + 12 = 24.
2. Atomic Number: The atomic number is the number of protons = 12.
3. Energy Levels: For an atom with 12 electrons, it has energy levels that can hold these electrons. The electron arrangement for an element with atomic number 12 (which is Magnesium, a common element with 12 electrons) is typically 2 in the first level and 8 in the second level, and 2 in the third level. This means it has 3 energy levels.
4. Valence Electrons: For magnesium, which has the electron configuration ending in 3s², it has 2 valence electrons.
5. Group in the Periodic Table: Since it has 2 valence electrons, it is in Group 2A.
6. Period in the Periodic Table: It has 3 energy levels, which means it is in Period 3.

Now, matching the answers to the choices:

• Mass Number: 24
• Atomic Number: 12 (not in the choices, so disregard)
• Energy Levels: 3
• Valence Electrons: 2 (not in the choices, so disregard)
• Group: 2A
• Period: 3

Final Choices:

• Mass number: 24
• Energy levels: 3
• Group: 2A

Since the choice of 12 is not among the options for mass number or valence electrons, I conclude with:

1. Mass number: 24
2. Atomic number: Not available (but is 12)
3. Energy levels: 3
4. Valence electrons: Not available (but is 2)
5. Group: 2A
6. Period: 3

You can select the correct options from the choices given based on the analysis.