Unit 3 Review

What element has the noble gas configuration [Ne]3s2 3p2?

• Aluminu

• Silicon

• Rubidium

• Tungston

What element has the noble gas configuration [He]2s1?

• Helium

• Beryllium

• Lithium

• Hydrogen

What element has the electron configuration 1s2 2s2 2s6 3s2 3p6 4s1?

• Beryllium

• Calcium

• Potassium

• Sodium

What element has the electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d5?

• Iron

• Manganese

• Magnesium

• Molebdenum

How many valence electrons (dots in a LDS) would Na have?

• 4

• 3

• 2

• 1

How many valence electrons (dots in a LDS) would As have?

• 5

• 4

• 3

• 8

How many valence electrons (dots in a LDS) would Ne have?

• 1

• 7

• 9

• 8

What electron configuration would 2 up arrows in a 4d orbital notation correspond to?

• 2d4

• 4d2

• Impossible to tell

• 2345d4543456

What element would end with 3 up arrows in the 4p orbital?

• Arsenic

• Sulfur

• Selenium

• Germanium

T or F? When following period numbers to find energy levels, you subtract one when moving into the d orbitals.

• True

• False