Chapter 17:The periodic table of elements 

Metallic bonds

________ are very strong and thus, high heat can overcome the forces of attraction.

Halogens

________ are very reactive non- metals because they have seven electrons in their outermost shell.

Alkali metals

________ get oxidised and therefore, they work as strong reducing agent.

horizontal rows

The elements in the periodic table are divided into periods and groups.Periods are ________.

non metallic

The elements in the periodic table can be classified based on their metallic and ________ properties.

periodic table

A(n) ________ is a listing of elements that are regulated in order of increasing atomic (proton) number.

imaginary diagonal line

There is a(n) ________ in the periodic table.

metallic bonds

The ________ are easily disrupted by heat.

Alkali metals

________ are very reactive.

Halogens

________ are those elements that are located in the group seven of the periodic table.

Alkali metals

________ lose electrons and become positively charged ions.