PT Review (CC - 2021)

In which pair is the larger species written first?

• Na > Na⁺

• F > F^1-

• Na > K

• Mg > Na

What atom matches this electron configuration?
1s² 2s² 2p⁶ 3s²

• Neon
• Magnesium
• Aluminum
• Potassium

How many valence electrons are in this element?

1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d³

• 3

• 2

• 5

• 23

The line with the shortest wavelength is produced in the hydrogen spectrum when electron moves

• from n=2 to n=1

• from n=4 to n=1

• from n=3 to n=1

• from n=4 to n=3

Line emission spectra is produced from atoms when

• electrons release energy as they move to their excited state.

• electrons absorb energy as they move to their excited state.

• electrons release energy as they return to the ground state.

• electrons absorb energy as they return to the ground state.

Which of the following is true for alkaline earth metals as their atomic number increases?

• Atomic radius decreases.

• Number of energy levels increases.

• Number of valence electrons decreases.

• Electronegativity increases,

The element with the lowest electronegativity in Period 3 is __.

• Na

• Cl

• Ar

• Mg

Which of these elements has the lowest ionization energy?

• Oxygen (O)
• Boron (B)
• Carbon (C)
• Fluorine (F)

Which electron configuration is correctly matched to the family?

• 1s² 2s² = alkali metal

• 1s² 2s² 2p⁵ = halogen

• 1s² 2s² 2p⁸ = noble gas

• 1s² = alkaline earth metal

Which best describes an orbital?

• probable location for an electron

• circular path that an electron follows

• region of space that holds electrons and protons

• region of energy that holds 2 electrons with the same spin