Questions

The reactivity of an atom arises from the existence of unpaired electrons in the valence shell.

Salinity is often high in enclosed seas, this is due to high temperature, rapid evaparation and little inflow of fresh water.

Helium has the lowest freezing point of all the elements. When coming to metals, mercury has the lowest freezing point of all the metals.

Economic resources are those goods and services that can be converted into valuable products for individual and business purposes.

There are four major types of economic resources:

1. land,

2. labor,

3. capital and

4. entrepreneurship.

Land and labor are natural and human resources, while capital means physical resources or money.

Entrepreneurship converts these resources into usable goods.

However, resources have finite values, and proper utilization depends on economic systems and economic decisions.