Chapter U1.10, Problem 5E

Interpretation Introduction

Interpretation:

The elements which are solid at room temperature are to be selected.

Concept introduction:

The periodic table is an organized chart of elements. The elements are arranged in groups and periods based on the similarities in their physical and chemical properties.

Answer to Problem 5E

Correct answer: b.titanium, Ti

c. lead, Pb

e. potassium, K

f. silicon, Si

Explanation of Solution

Reason for correct option:

Most elements are metals and are solids at room temperature. Several elements are gases at room temperature, but only few are liquids at or near room temperature. Titanium, lead and potassium are metals while silicon is a metalloid.

Titanium, lead, potassium and silicon are solids at room temperature. Fluorine and oxygen are gases at room temperature. So the correct options are:

b.titanium, Ti

c. lead, Pb

e. potassium, K

f. silicon, Si

Conclusion

Reasons for incorrect options:

1. Fluorine, F - Several non - metals are gases at room temperature. Fluorine belongs to the group of halogens and is a non - metal. It is a gas at normal temperature. Hence, this option is not correct.

d. Oxygen, O - Oxygen is a non - metal and so it is a gas at room temperature. Hence, this is an incorrect option.