Chapter 2, Problem 2.41P

Interpretation Introduction

(a)

Interpretation:

State true and false:

Mendeleev discovered that when elements are arranged in order of increasing atomic weight, certain sets of properties recur periodically.

Concept Introduction:

The periodic variation of properties and structures are shown when the elements are arranged in increasing atomic numbers is said to periodic law.

Interpretation Introduction

(b)

Interpretation:

State true and false:

Main group elements are those in the columns 3A to 8A of the periodic table.

Concept Introduction:

The periodic variation of properties and structures are shown when the elements are arranged in increasing atomic numbers is said to periodic law.

Interpretation Introduction

(c)

Interpretation:

State true and false:

Non-metals are found at the top of the periodic table, metalloids in the middle, and metals at the bottom.

Concept Introduction:

The periodic variation of properties and structures are shown when the elements are arranged in increasing atomic numbers is said to periodic law.

Interpretation Introduction

(d)

Interpretation:

State true and false:

Among the 118 known elements, there are approximately equal numbers of metals and non-metals.

Concept Introduction:

The periodic variation of properties and structures are shown when the elements are arranged in increasing atomic numbers is said to periodic law.

Interpretation Introduction

(e)

Interpretation:

State true and false:

A horizontal row in the periodic table is called a group.

Concept Introduction:

The periodic variation of properties and structures are shown when the elements are arranged in increasing atomic numbers is said to periodic law.

Interpretation Introduction

(f)

Interpretation:

State true and false:

The group 1A elements are called the “alkali metals”.

Concept Introduction:

The periodic variation of properties and structures are shown when the elements are arranged in increasing atomic numbers is said to periodic law.

Interpretation Introduction

(g)

Interpretation:

State true and false:

The alkali metals react with water to give hydrogen gas and a metal hydroxide, MOH, where “M” is the metal.

Concept Introduction:

The periodic variation of properties and structures are shown when the elements are arranged in increasing atomic numbers is said to periodic law.

Interpretation Introduction

(h)

Interpretation:

State true and false:

The halogens are group 7A elements.

Concept Introduction:

The periodic variation of properties and structures are shown when the elements are arranged in increasing atomic numbers is said to periodic law.

(i)

Interpretation Introduction

Interpretation:

State true and false:

The boiling points of noble gases increase going from top to bottom of the column.

Concept Introduction:

The periodic variation of properties and structures are shown when the elements are arranged in increasing atomic numbers is said to periodic law.