Assessment

What electron configuration matches an oxygen atom?

• 1s²2s²2p⁶3s2, 3p⁶4s²3d¹⁰4p⁵

• 1s²2s²2p⁴

• 1s²2s²2p⁶

• 1s²2s²2p⁶3s²3p⁶4s²3d¹

How many electrons does Si contain?

• 14

• 28

• 2

• 4

How many valence electrons are represented here?

• 7

• 5

• 2

• 8

How many orbitals are in the 4d sublevel?

• 2

• 4

• 5

• 10

How many unshared pairs of electrons are in this orbital diagram?

• 2

• 3

• 5

• 15

Is it possible to have a 7d orbital?

• TRUE

• FALSE

Number of electrons that can be in 3p orbitals?

• 6

• 8

• 3

• 1

A valid magnetic quantum number for the element Si is -3.

• TRUE

• FALSE

What do the numbers 1-7 stand for in an electron configuration?

• Letters

• Subshells

• Electrons

• Elements

Calcium has an atomic number of 20. A stable calcium atom has an electronic configuration of:

• 1s²2s²2p⁶3s²3p⁶4s²

• 1s²1p⁶1d¹⁰1f²

• 1s²2s²2p⁶3s²3p⁶3d²

• 1s²1p⁶1d⁷