Atomic Structure Quizziz Review 2024-2025

Naturally occurring lithium is a combination of two isotopes that contains 7.6% Li-6 and 92.4% Li-7. In terms of subatomic particles, which of the following best explains why Li-6 and Li-7 are considered isotopes of the same element.

• Li-6 and Li-7 have the same number of neutrons and different numbers of protons
• Li-6 and Li-7 have different atomic numbers but the same mass number
• Li-6 and Li-7 have the same number of protons and different numbers of neutrons
• Li-6 and Li-7 have the same atomic number but different mass numbers

The bright-line spectra observed in a spectroscope for three elements and a mixture of two of these elements are represented in the diagram below. Identify which elements are in the mixture? Check all that apply

• Element A
• Element D
• Element X
• Element Z
• none of the above

The bright-line spectra observed in a spectroscope for three elements and a mixture of two of these elements are represented in the diagram below. Which of the following best explains what each spectral line represents?

• electrons absorb energy as the move from ground to excited state
• electrons absorb energy as the move from excited to ground state
• electrons emit energy as the move from ground to excited state
• electrons emit energy as the move from excited to ground state

The following table shows information for six samples of different elements. Which of the following samples are isotopes?

• samples A and B
• samples C and D
• samples D and E
• samples E and F

The atomic mass of chlorine is 35.5 amu. The only naturally occurring isotopes of are Cl-35 and Cl-37. The percent abundances in a naturally occurring sample of element A are closest to...

• 0% Cl-35 and 100% Cl-37
• 25% Cl-35 and 75% Cl-37
• 50% Cl-35 and 50% Cl-37
• 75% Cl-35 and 25% Cl-37
• 100% Cl-35 and 0% Cl-37

The table below gives the atomic mass and the abundance of the two naturally occurring isotopes of copper.

• (62.93 u)(30.85) + (64.93 u)(69.15)
• (62.93 u)(0.3085) + (64.93 u)(0.6915)
• (62.93 u)(69.15) + (64.93 u)(30.85)
• (62.93 u)(0.6915) + (64.93 u)(0.3085)

Which part of a calcium atom in the ground state is represented by the dots in its Lewis electron-dot diagram?

• the inner electrons that occupy the first 3 electron shells
• the outermost electron in the 4th shell
• the valence neutrons in the third shell
• the number of electrons located within the nucleus

Which of the following Lewis dot diagrams would represent an phosphorus atom. Write the letter in the space provided.

• E
• A
• B
• C
• D

In the land of make-believe, the atomic mass of the element Magoatite (Ma) is 63.6 atomic mass units. The only naturally occurring isotopes of Magoatite are Ma-63 and Ma-65. The percent of Magoatite are closest to

• 31% Ma-63 and 69% Ma-65
• 50% Ma -63 and 50% Ma -65
• 69% Ma -63 and 31% Ma -65
• 100% Ma 63 and 0% Ma -65

Which statement describes the earliest model of the atom?

• An atom is an indivisible hard sphere.
• An atom has a small, dense nucleus.
• The atom is mostly empty space.
• Electrons are negative particles in an atom.