Periodic trends in the modern periodic table

Compare the sizes of $\mathrm{Cu}$, $\mathrm{Ag}$ and $\mathrm{Au}$.

The position of eight elements in the modern periodic table is given below where atomic numbers of the elements are given in parenthesis.

Which one of these elements has the largest atom in size?

The atomic size of chlorine is greater than fluorine because:

Which halogen has the largest atomic radius?

The solid halogen is:

The atomic number of nitrogen is $7$. So, valency of nitrogen is $5$.

Atomic numbers of five elements $\mathrm{A}, \mathrm{B}, \mathrm{C}, \mathrm{D}$ and $\mathrm{E}$ are $6, 8, 3, 7$ and $9$ respectively. Among these which elements have highest electropositivity?

$11, 12, 13$ and $14$ are the atomic numbers $\mathrm{Na}, \mathrm{Mg}, \mathrm{Al}$ and $\mathrm{Si}$ respectively. Which element have more atomic radius ?

Observe the given table and answer the following question:

The elements that belong to the same period are:

Observe the given table and answer the following question:

The elements that belong to the same group are:

Atomic size of elements increases from top to bottom in a group as more electrons are added to the same _____. (atom / shell)

The atomic numbers of two elements are $8$ and $16$ respectively, which belong to the same group of the modern periodic table. Out of these two elements, the element with atomic number $16$ is more electronegative than the element with atomic number $8$.

The atomic numbers of two elements are $8$ and $16$ respectively. These two elements belong to the same group of the modern periodic table.

Arrange the following elements in the decreasing order of their atomic size:

$\mathrm{Na}, \mathrm{Rb}, \mathrm{Cs}, \mathrm{Li}, \mathrm{K}$

How the electronegativity of elements show periodicity in periodic table?

How the atomic radius of elements show periodicity in periodic table? 

Valency shows which type of periodic property while going from left to right in a period?  

Members of which groups have the highest metallic properties: 

In periodic table, on moving down a group, atomic size, 

Name the smallest atom in the third period. (Sodium / Aluminium / Chlorine)