An element A has 2 electrons in its fourth shell. State its electronic configuration.

One Line Answer

Its electronic configuration is 1s²2s²2p⁶3s²3p⁶4s².

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Chapter 5: The Periodic Table - Exercise 5 (C) [Page 95]

Chapter 5 The Periodic Table
Exercise 5 (C) | Q 9.2 | Page 95

Compare and contrast the arrangement of elements in Mendeleev’s periodic Table and the Modern Periodic Table.

Fill in the following blank with suitable word:

Group 1 elements are called ...............

(b) What is the number of elements is 3rd period, the modern periodic table?

What are the advantages of the periodic table?

Name two elements in each case:

Actinides

Name the type of elements which have two electrons in the outermost orbit.

Name an alkali metal in period 3 and halogen in period 2.

Give the symbol and valency of the following element and radical.

Sodium

Give the symbol and valency of the following element and radical.

Ammonium

Give the chemical formula of magnesium nitrate