Q1. In the Rutherford nuclear-atom model, which statement is correct?

Background

Topic: Atomic Structure – Rutherford Model

This question tests your understanding of the structure of the atom as described by Rutherford, especially the arrangement and mass of subatomic particles.

Key Terms:

• Proton (p+): Positively charged particle in the nucleus.

• Neutron (n°): Neutral particle in the nucleus.

• Electron (e-): Negatively charged particle outside the nucleus.

• Nucleus: Dense center of the atom containing protons and neutrons.

Step-by-Step Guidance

1. Recall that Rutherford's gold foil experiment led to the discovery that atoms have a small, dense nucleus.

2. Consider which subatomic particles are found in the nucleus and which are outside it.

3. Think about the relative masses of protons, neutrons, and electrons.

4. Eliminate any answer choices that incorrectly describe the location or mass of these particles.

Try solving on your own before revealing the answer!

Q2. All atoms of a given element have the same __________.

Background

Topic: Atomic Number and Isotopes

This question tests your understanding of what defines an element and the properties that are constant for all atoms of a given element.

Key Terms:

• Atomic Number (Z): The number of protons in the nucleus of an atom.

• Isotope: Atoms of the same element with different numbers of neutrons.

Step-by-Step Guidance

1. Recall the definition of an element in terms of its atomic structure.

2. Consider which subatomic particle is used to identify an element on the periodic table.

3. Think about whether the number of neutrons or electrons can vary for atoms of the same element.

Try solving on your own before revealing the answer!

Q3. How many electrons, protons, and neutrons are in an atom of 13254Xe?

Background

Topic: Isotopic Notation and Subatomic Particles

This question tests your ability to interpret isotopic notation and determine the number of each subatomic particle in an atom.

Key Terms and Formulas:

• Atomic Number (Z): Number of protons

• Mass Number (A): Number of protons + neutrons

• Number of Neutrons:

• Number of Electrons: For a neutral atom, electrons = protons

Step-by-Step Guidance

1. Identify the atomic number (Z) and mass number (A) from the notation .

2. Determine the number of protons (equal to Z).

3. Calculate the number of neutrons using .

4. For a neutral atom, the number of electrons equals the number of protons.

Try solving on your own before revealing the answer!

Q4. Which combination of protons, neutrons, and electrons is correct for the isotope of copper, 6329Cu?

Background

Topic: Isotopic Notation and Subatomic Particles

This question tests your ability to interpret isotopic notation for a specific element and isotope.

Key Terms and Formulas:

• Atomic Number (Z): Number of protons

• Mass Number (A): Number of protons + neutrons

• Number of Neutrons:

• Number of Electrons: For a neutral atom, electrons = protons

Step-by-Step Guidance

1. Identify the atomic number (Z) and mass number (A) from the notation .

2. Determine the number of protons (equal to Z).

3. Calculate the number of neutrons using .

4. For a neutral atom, the number of electrons equals the number of protons.

Try solving on your own before revealing the answer!

Q5. Which pair of atoms constitutes a pair of isotopes of the same element?

Background

Topic: Isotopes

This question tests your ability to recognize isotopes, which are atoms of the same element with different numbers of neutrons.

Key Terms:

• Isotope: Atoms with the same number of protons (same atomic number) but different numbers of neutrons (different mass numbers).

Step-by-Step Guidance

1. Look for pairs with the same atomic number (bottom left number) but different mass numbers (top left number).

2. Check each answer choice to see which pair meets this criterion.

3. Eliminate pairs with different atomic numbers, as they are different elements.

Try solving on your own before revealing the answer!