Review Chem

The electron configuration for tin is 1s22s22p63s23p64s23d104p65s24d105p2. Which electrons are lost in the formation of the Sn4+ cation? Two electrons from 5p and two electrons from 5s. Four electrons from 4d. Two electrons from 5p and two electrons from 4d. Two electrons from 4d and two electrons from 5s.

Two electrons from 5p and two electrons from 5s.

Identify what is wrong in the electron configuration. Ca = 1s11s22s22p63s23p64s2

1S1

Select the correct electron configuration for F− 1s22s22p53s1 1s22s22p6 1s22s23p5 1s22s22p4

1s22s22p6

Select the correct electron configuration for Na+

1s22s22p6

Select the correct electron configuration for Na+ *1s22s22p63s1 *1s22s22p53s1 *1s22s22p63s2 *1s22s22p6

1s22s22p6

Select the correct electron configuration for Cr. 1s22s22p63s23p64s14d5 1s22s22p63s23p64s24d4 1s22s22p63s23p64s13d5 1s22s22p63s23p64s23d4

1s22s22p63s23p64s13d5

How many electrons can be found in an individual orbital? 10 14 2 6 8 1

2

How many valence electrons are present in sulfur? 16 6 32 4

6

How many d electrons are found in cobalt? 5 7 2 10

7

Which pair of elements will have a similar valence shell electron configuration? Nitrogen (N) and sulfur (S) Nitrogen (N) and oxygen (O) Nitrogen (N) and carbon (C) Nitrogen (N) and phosphorus (P)

Nitrogen (N) and phosphorus (P)

The presence of unpaired electrons in an atom determines whether or not an atom is attracted to a magnet or not. Are there unpaired electrons in phosphorus? If so, how many? Yes, 2 Yes, 3 Yes, 1 No

Yes, 3

Which set of orbitals can hold a maximum of 14 electrons? f p s d

f orbitals

Which energy level is the closest to the nucleus?

n=2

Metals tend to _______ electrons to form _______.

lose, cations

Using the periodic table, fill in the missing component of the electron configuration for magnesium. Mg = 1s22s22p63s___ 1 2 (small 2) 2 s 1 p

Small "2"

The electron configuration for Na+ is 1s22s22p6.

When determining the electron configuration of an ion, first write the configuration of the neutral atom. For Na, it is 1s22s22p63s1. One electron is lost to form the sodium ion. When forming a cation, the electron is removed from the energy level with the highest n value. Within the highest energy level, electrons are removed in order of p then s. The electron is lost from the 3s orbital. Remember that orbitals fill in order of increasing energy, beginning with 1s, 2s, 2p, 3s, and so on. In addition, the s orbitals hold a maximum of two electrons, whereas each p orbital holds two for a maximum of six electrons in the p orbitals.