What is the Common Feature of Electronic Configurations of the Elements at the End of Period 2 and Period 3? - Chemistry

What is the common feature of electronic configurations of the elements at the end of period 2 and period 3?

One Line Answer

The elements at the end of period 2 and period 3 both have their outermost shell complete and belong to noble gases.

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Chapter 1: Periodic Properties And Variation Of Properties: Physical And Chemical - Exercise 4 [Page 19]

Chapter 1 Periodic Properties And Variation Of Properties: Physical And Chemical
Exercise 4 | Q 1.1 | Page 19

Elements in the same group show the same valency. Give scientific reason.

Classify the following elements into metals, non-metals and metalliods

As, C, Hg, Mg, S, Si

An element Z has atomic number 16. Answer the following questions on Z:

1) State the period and group to which Z belongs

2) Is Z a metal or a non-metal?

3) State the formula between Z and hydrogen

4) What kind of a compound is this?

How does the number of valence electrons vary on moving from left or right in the second period of the periodic table?

Arrange the following in increasing order of property indicated
SiO₂, P₂O₅, SO₃, Cl₂O₇ (acidic nature)

Select the correct answer
Number of shells in potassium are

How many elements are there in period 2?

The following questions refer to the Periodic Table.
Name the first and last element in period 2.

With reference to the variation of properties in the Periodic table, which of the following is generally true?

State the property trends in general of elements on moving from left to right in a period of the periodic table.