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Electronic configuration

Elements with...

Question

Elements with configuration 2, 8, 2 and 2, 7 are placed in Modern Periodic Table write the position in Modern Periodic table and identify their valencies and write the formula of compound formed by their combination

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Solution

Element with configuration 2,8,2 is magnesium which is alkaline earth metal and lies in the group 2 and has a valency of 2, as it is easy for mg to lose 2 electrons and attain stable configuration

Element with cinficonfigur 2,7 is fluorine which is a halogen and is in the 17 th group, and it has a valency of 1, it can accept one electron and attain stable configuration

Combination of mg and F would produce MgF2

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Q. Elements with configuration 2, 8, 2 and 2, 7 are placed in modern periodic table. Find out:
1. the valency of the elements mentioned above.
2. the period and group of the above elements.

Q. (a) What were the two major shortcomings of Mendeleev's periodic table? How have these been removed in the modern periodic table?
(b) Two elements X and Y have atomic numbers 12 and 16 respectively. Write the electronic configuration for these elements. To which period of the modern periodic table do these two elements belong? What type of bond will be formed between them and why?
(c) To which groups of the modern periodic table do the elements X and Y belong? Give reason for your answer.
(d) What could the elements X and Y be? Write their names and symbols.

Q. Assertion :The modern periodic table remove various anomalies of Mendeleev's periodic table. Reason: Modern periodic table was based on the atomic number rather than atomic weight of the elements. The missing elements were given position with their properties in modern table.

Q. Which of the following statement(s) about the Modern periodic table is/are incorrect?
(i) The elements in the Modern periodic table are arranged on the basis of their decreasing atomic number.
(ii) The elements in the Modern periodic table are arranged on the basis of their increasing atomic number
(iii) Isotopes are placed in an adjoining group(s) in the periodic table.

(a) State modern periodic law.

(b) How does the electronic configuration of the atom of an element relate to its position in the modern periodic table?

(c) How could the modern periodic law remove various anomalies of Mendeleev’s periodic table? Explain with examples.

(d) Is it possible to have an element having atomic number 1.5 placed between hydrogen and helium?

(e) Name the scientist who prepared the modern periodic table.

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