Question

How do we find the number of neutrons in an atom?
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1 point
Add the atomic number and mass number together
Subtract the number of electrons from the number of protons
Subtract the number of protons from the mass number
Answer
Which of the following does the atomic number of an atom or element represent?
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1 point
The number of protons in the atom
The number of neutrons in the atom
The number of particles in the nucleus of the atom
Answer
A molecule of ethanol has two carbon atoms, six hydrogen atoms, and one oxygen atom. A ball-and-stick model of a molecule of ethanol is made from the following components:

one red ball
two black balls
six white balls
eight sticks

What do the white balls in this model represent?
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1 point
Captionless Image
Carbon atoms
Bonds between atoms
Hydrogen atoms
Answer
Which term describes the repeated arrangement of the same molecule?
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1 point
bonds
extended structure
molecular model
Answer
Use the periodic table to answer the question.

Which Statement about magnesium [Mg] and calcium [Ca] is correct?
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Captionless Image
They are both classified as noble gases.
They both have the same number of valence electrons.
They both have the same number of electron shells.
Answer
What type of molecular model is represented in the diagram below?
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1 point
Captionless Image
Lewis Dot Structure
Ball and stick
Space-fill
Answered by GPT-4o mini
To find the number of neutrons in an atom, you should **subtract the number of protons (atomic number) from the mass number**.

So, the correct option is:
**Subtract the number of protons from the mass number.**
Answered by GPT-4o mini
The atomic number of an atom or element represents **the number of protons in the atom**.

So the correct answer is:
**The number of protons in the atom.**
Answered by GPT-4o mini
In the ball-and-stick model, the **white balls** represent **hydrogen atoms**.

So the correct answer is:
**Hydrogen atoms.**
Answered by GPT-4o mini
The term that describes the repeated arrangement of the same molecule is **extended structure**.

So the correct answer is:
**extended structure.**
Answered by GPT-4o mini
Magnesium (Mg) and calcium (Ca) are both alkaline earth metals found in Group 2 of the periodic table. They both have **2 valence electrons**.

However, they do not have the same number of electron shells; magnesium has 3 electron shells, while calcium has 4.

Thus, the correct statement is:
**They both have the same number of valence electrons.**
Answered by GPT-4o mini
Without the ability to see the specific diagram you are referring to, I can provide a general description of the three types of molecular models:

1. **Lewis Dot Structure**: Represents the valence electrons of an atom as dots and shows how they are shared or transferred in bonds between atoms.

2. **Ball and Stick Model**: Uses balls to represent atoms and sticks to represent the bonds between them, illustrating the 3D arrangement of atoms in a molecule.

3. **Space-fill Model**: Represents atoms as spheres whose sizes are proportional to the atoms' radii, showing the relative sizes and positions of the atoms in a molecule as they would exist in space.

If you can determine which model shows the atoms connected with sticks representing bonds, it is the **Ball and Stick Model**. If it shows just dots for electrons, it is a **Lewis Dot Structure**. If it focuses on the volume of the atoms, it is a **Space-fill model**.

Please use these descriptions to identify the model in your diagram.