The periodic table

From Lithium to Francium reactivity

• Decreases

• Increases

• Remains same

• First decreases then increases

From Fluorine to Astatine reactivity

• Increases

• Decreases

• Remains same

Across a period the oxides turn from

• Basic to acidic

• Acidic to basic

• Remain neutral

• The acidic oxides turn neutral

Down the group reactivity increases because

• Number of protons increase

• Number of electrons increase

• Number of shells increase

• Basic nature increases of elements

Across a period the number of ....................remains same.

Density of both metals and non metals...........down the group

• Decreases

• Remains constant

• Varies depending on temperature

• Increases

Atomic radius increases down the group because

• Number of electrons increases

• Nucleus increases

• Number of shells increases

• Radioactivity increases

Reactivity of group 8 elements down the group

• Increases

• Decreases

• Remains same

• First increases then decreases

In modern periodic table elements are arranged in order of increasing

• Mass number

• Atomic number

• Metallic character

• Neutron number

Group and period of element having atomic umber 15 is

• 5, 3

• 3,5

• 2,5

• 5,2