Chapter 6, Problem 40A

Interpretation Introduction

(a)

Interpretation:

The chemical symbol of the element in the period 3 that can be used in making computer chips needs to be determined.

Concept introduction:

The chemical symbol is the designation for the element. It may be one or two letter symbol. Its first letter is always in capital letter and the second letter is always in lowercase. Some examples of chemical symbols are O for Oxygen, Na for sodium, Ca for Calcium etc.

Answer to Problem 40A

Chemical symbol the element which is used in making computer chips is ‘Si’.

Explanation of Solution

The horizontal rows in the periodic table are termed as rows and the vertical columns are termed as groups. There are 7 period and 18 groups in the periodic table. In 3^rd period only one metalloid present, Silicon. Silicon is used in making computer chips.

(b)

Interpretation Introduction

Interpretation:

The chemical symbol of the element which belong to group 13 and 5^th period and used in making flat screens for televisions needs to be determined.

Concept introduction:

The chemical symbol is the designation for the element. It may be one or two letter symbol. Its first letter is always in capital letter and the second letter is always in lowercase. Some examples of chemical symbols are O for Oxygen, Na for sodium, Ca for Calcium etc.

Answer to Problem 40A

The chemical symbol of the element which is used in making flat screen for televisions is ‘In’

Explanation of Solution

There are 18 groups and 7 periods in the periodic table. The element which belongs to group 13 and 5^th period is Indium which is used in making flat screens for televisions. The chemical symbol of Indium is ‘In’.

(c)

Interpretation Introduction

Interpretation:

The chemical symbol for the element used as filament needs to be determined.

Concept introduction:

The chemical symbol is the designation for the element. It may be one or two letter symbol. Its first letter is always in capital letter and the second letter is always in lowercase. Some examples of chemical symbols are O for Oxygen, Na for sodium, Ca for Calcium etc.

Answer to Problem 40A

The chemical symbol of the element used in light bulbs is ‘W’.

Explanation of Solution

Given that the element which is used as filament in light bulbs has the highest atomic mass of the natural elements in group 6. The natural element of highest atomic mass of group 6 is Tungsten. Therefore, Tungsten is the element used as filament of bulbs and its chemical symbol is ‘W’