Question

What are the trends in modern periodic table explain briefly.

Answer 1

in modern periodic table, elements are arranged in the increasing order of their atomic numbers.

1.in periodic table vertical rows are called groups and horizontal  rows are called periods.
2.there are 18 groups and 7 periods in modern periodic table.
3.mostly modern periodic table is prepared on electronic configuration.
4.in first period there are two elements which is called shortest period.
5.in second period and third period there are 8 elements each which are called short periods.
6.in fourth and fifth periods 18 elements exist which are long periods.
7.in sixth period 32 elements exist which is longest period.
8.7th period is incomplete period.It includes 14 actinides.

Answer 2

$\huge\mathfrak{\red{Heya\:Mate}}$

$\large\textbf{\underline{HERE\:IS\:YOUR\:ANSWER}}$

Trends in the Modern Periodic Table are:-

⏩ Valency.

⏩ Atomic Size.

⏩ Metallic and Non-Metallic properties.

${\mathfrak{\underline{Valency}}}$

The valency of an element determined by the number of valence electrons present in the outermost shell of its atom.

⏺ Valency down a group same.

⏺ Valency across a period (left to right) varies ie. first increases then decreases.

${\mathfrak{\underline{Atomic\:Size}}}$

The atomic size is the distance between the center of the nucleus and the outermost shell of an isolated atom.

⏺Across a period, Left to right atomic size decrease and Right to left increases.

⏺Atomic size increase down a group.

${\mathfrak{\underline{Metallic\:and\:Non-metallic\:properties}}}$

In the modern periodic table, a zig-zag line separates metals from non-metals.

⏺ Metal tend to lose electrons while forming bonds. So they are electropositive in nature.

⏺️ Non-metal tend to form bonds by gaining electrons. So they are electronegative in nature.

$\large\textbf{HOPE\:IT\:HELPS\:YOU!!}$