AS Physical Chemistry exam 1

Ionisation energy is ___________.

• maximum energy required to remove 1 electron from 1 mol of gaseous atom

• minimum energy required to remove 1 electron from 1 mol of gaseous atom

• first ionisation energy

• second ionisation energy

When going down a group, the atomic size increases so the first IE __________.

• increases

• decreases

• constant

• I am not sure

Factors affecting the ionisation energy:

• Atomic radius

• Effective nuclear charge

• Shielding effect

• All of the above

Which element has the greater ionization energy?

• Lead
• Silicon

The correct electronic configuration of Cr (Z=24) is

• [Ar] 3d ⁵ 4s ¹

• [Ar] 3d ⁴ 4s 2

• [Ar] 3d ⁹ 4s 2

• [Ar] 3d ¹⁰ 4s ¹

What is the small, DENSE REGION consisting of protons and neutrons at the CENTER of an atom?

• Molecules

• Nucleus

• Subatomic particle

• Atoms

What electron configuration matches an oxygen atom?

• 1s²2s²2p⁶3s2, 3p⁶4s²3d¹⁰4p⁵

• 1s²2s²2p⁴

• 1s²2s²2p⁶

• 1s²2s²2p⁶3s²3p⁶4s²3d¹

Identify the Electron Configuration for Aluminum (Al)

• 1s² 2s² 2p⁶ 3s² 3p¹

• 1s² 2s² 2p⁶ 3s² 3p³

• 1s² 2s² 2p⁶ 3s² 4p¹

Valence electrons are located...

• inside the nucleus

• in outer space

• on the outermost orbit of an atom

What is incorrect about this orbital diagram?

• Both arrows in the 2p box should be pointing up
• There is nothing incorrect with this diagram
• In the 2p box there should only be 1 electron in the first 2p box and one in the 2nd 2p box
• All the arrows should be pointing up.