Chemistry--Unit 2 Review

Which statement below is NOT a true statement about the structure of an atom?

• The majority of an atom is empty space associated with the electron cloud.

• The nucleus of an atom is very large and contains protons and neutrons.

• The nucleus possesses a positive charge associated with protons.

• The nucleus contains neutrons which carry no charge.

Tags

NGSS.HS-PS1-8

Choose the statement below that accurately describes the number of neutrons in Argon-41.

• It is impossible to know how many neutrons are in Argon-41.

• Argon-41 contains 18 neutrons in an atom.

• Argon-41 contains 41 neutrons in an atom.

• Argon-41 contains 23 neutrons in an atom.

Ernest Rutherford fired positively charged alpha particles at gold foil. A few of the alpha particles were deflected slightly or bounced off. From this data scientists concluded

• The nucleus is very small and has no charge.

• The nucleus is very diffuse and the protons and neutrons are very far apart.

• The nucleus is very small and is positively charged.

• The nucleus contains electrons which attracted the positively charged alpha particles.

Which energy-level change shown in the diagram below emits the highest energy?

• an electron moving from E₆ to E₅

• an electron moving from E_{2 to} E₄

• an electron moving from E₂ to E₃

• an electron moving from E₂ to E₁

Tags

NGSS.HS-PS4-3

What is the electron configuration for nitrogen?

• 1s² 2s² 2p³

• 1s² 2s³ 2p²

• 1s² 2s³ 2p¹

• 1s² 2s² 2p² 3s¹

Tags

NGSS.HS-PS1-1

The orbital notation for an atom is shown. Choose the statement that represents the element and the reason for the answer.

• The element is Boron because the atom contains 1 electron in the 3p sublevel.

• The element is Lithium because the atom contains 3 electrons.

• The element is Aluminum because the atom contains 1 electron in the 3p sublevel.

• The element is Ne because the valence shell is completely filled.

Tags

NGSS.HS-PS1-1

Mendeleev's periodic table contained empty spaces. Which statement correctly explains the importance of those spaces?

• The empty spaces represented elements that had not been discovered. The table predicted the properties of the unknown elements.

• The empty spaces represent elements that could not exist because of periodic trends.

• The empty spaces represented new isotopes of previously discovered elements.

• The empty spaces showed the electron configurations of the ions in the periodic table.

Tags

NGSS.HS-PS1-1

A new element is discovered. Scientists observe that the element is solid, shiny, and conducts electricity. Which group of elements would the new element best be grouped with?

• Nonmetals

• Metals

• Noble gases

• Metalloids

Tags

NGSS.HS-PS1-1

Which electron configuration below represents an atom that has 8 valence electrons?

• 1s⁰2s¹

• 1s²s²s

• 1s²2s²2p²

• 1s²2s²2p⁶

Tags

NGSS.HS-PS1-1

Which of the following electron configurations describes a transition metal?

• 2s¹

• 1s²2s²2p²

• 1s²2s²2p⁶

Tags

NGSS.HS-PS1-1