Chapter 6, Problem 6.95UTC

(a)

Interpretation Introduction

Interpretation:

To explain the formation of a magnesium ion by octet rule.

Concept introduction:

According to octet rule, the combination of atoms to form molecule or formation of ions takes place in such a way that each atom has 8 electrons in its valence shell.

Answer to Problem 6.95UTC

Solution:

By losing 2 electrons from valence shell that is third energy level of magnesium it achieves an octet.

Explanation of Solution

Magnesium is an element of group 2A (2) that is it has two valence electrons after losing of which it obtains octet that is the number of valence electron in magnesium ion will be 8 after losing 2 electrons.

(b)

Interpretation Introduction

Interpretation:

The noble gas which has same electronic configuration as magnesium ion.

Concept introduction:

According to octet rule, the combination of atoms to form molecule or formation of ions takes place in such a way that each atom has 8 electrons in its valence shell.

Answer to Problem 6.95UTC

Solution:

  $\text{Ne}$

Explanation of Solution

Atomic number of magnesium is 12 and the electron configuration for the ${\text{Mg is [Ne] 3s}}^{\text{2}}\text{.}$After losing 2 electrons its electron configuration will be: ${\text{[Ne] 3s}}^0$ that is $\text{[Ne]}$ . Hence, neon is the noble gas which has same electronic configuration as magnesium ion.

(c)

Interpretation Introduction

Interpretation:

The reason why Group 1 and 2 elements found in many compounds, but not that of Group 18 elements.

Concept introduction:

According to octet rule, the combination of atoms to form molecule or formation of ions takes place in such a way that each atom has 8 electrons in its valence shell.

Answer to Problem 6.95UTC

Solution: Group 1A and 2A elements achieve octets by losing electrons to form compounds whereas group 8A (18) elements are stable with octet.

Explanation of Solution

Group 1A and 2A elements achieve octets by losing one and two electrons respectively and thus forming compounds whereas group 8A (18) elements are stable with octet.