ABTA 2020-21 SUGGESTION PERIODIC TABLE AND PERIODICITY OF THE ELEMENTS

 Periodic table and periodicity of the elements:

ABTA 2020-21 Suggestion 

(ENGLISH TRANSLATION)

Today we are solving important questions for Period Table from ABTA. We all are aware of ABTA test papers. ABTA test papers are the most trusted test paper collection for west Bengal class 10 candidates. In our today's article, we are providing you the solution to ABTA Suggestion 2020-21 for Periodic Table.

This year ABTA suggestion 2020-21 has given only 2 marks and 3 marks question from the chapter Periodic Table.

At first, we are solving ABTA suggestion 2020-21 Periodic Table 2 marks questions.

1. Short Answer Based Questions: (Marks 2) 

(a) What is ionization energy?

Ans: It is the amount of energy required by an electron in a gaseous atom or ion to come out of the orbit.

(b) What is meant by electronegativity?

Ans: Electronegativity is a measure of an atom's ability to attract shared electrons to itself.

(c) What is meant by transuranic element? Give an example of an element.

Ans: Elements with atomic numbers greater than 92, are called transuranic elements. These elements don't exist alone. They are formed by the disintegration of other atoms.

An example of an such element is Rubidium.

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(d) Write the modern periodic law.

Ans: Moden Periodic Law states that "Physical and chemical properties of an element are the periodic function of their atomic number."

(e) What is meant by the periodic properties of elements? Refers to a property that is not periodic property.

Ans: By periodic law, we know the properties of an element are the periodic function of their atomic number. These properties again reappear after an interval. This phenomenon is called the periodic property of elements.

Radioactivity is not a periodic property.

(f) An atom of any element has 11 electrons and 12 neutrons. The position of the element in Mendeleev's periodic table cannot be determined by the number of which particles. In which period and in which group is the element located in Mendeleev's periodic table?

Ans: The position of the element in Mendeleev's periodic table can not be determined by the number of neutrons.

Since the element has 11 electrons i.e. its atomic number is 11. Now 12 neutrons and 11 electrons together make 23 which becomes the mass number.

Atomic number 11 gives electronic configuration as 2,8,1. So 3shells are their i.e. 3rd period and 1 outermost electron indicates 1st group.

so, the final position of the element is the 3rd period and 1st group.

(g) Arrange the given elements according to the decreasing ion strength: Cs, K, Li, Na, Rb.

Ans: Cs< Rb< K<Na<H

(h) Name a chalcogen element and a solid halogen element.

Ans: Chalcogen element: Group 16 elements are called chalcogen elements. Example Oxygen.

Solid Halogen Element: Iodine

Liquid Halogen Element: Bromine

Gaseous Halogen Element: Chlorine

(i) Why are group 2 elements called alkaline clay metals in the modern periodic table?

Ans: Group 2 elements are present on the earth's crust, so they are called so.

(j) In writing two properties of conjugate elements.

Ans: 

Do You Need More Suggestion on Physical Science:

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ABTA 2020-21 SUGGESTION: CURRENT ELECTRICITY

ABTA 2020-21 SUGGESTION: PERIODIC TABLE

ABTA 2020-21 SUGGESTION: IONIC AND COVALENT BOND

ABTA 2020-21 SUGGESTION: ELECTRICITY AND CHEMICAL REACTION

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Now We are going to start our 3 Marks section from ABTA suggestion 2020-21 Period Table.

Long answer-based questions: (Question 3).

(a) State Newland's octet rule. Give an example of a periodic property.

Ans: Newland's octet rule states that "every eighth element has same physical and chemical property when the elements are arranged in increasing order of their atomic mass."

Atomic radius is a  periodic property.

(b) What is the unit of ionization energy? What kind of change can be noticed across the period and group?

Ans: unit of ionization energy: Kilojoule/mol (kj/mol)

Down a Group: Decreases

Along a Period: Increases

(c) Mention two errors of Mendeleev's periodic table. In which group and period is it reasonable to place the element 18 X 40?

Ans: Errors of Mendeleev's periodic table: 

(i) Placement of isotopes can not be explained.

(ii) Placement of Hydrogen can not be explained

(iii) Gold and Platinum have the same chemical property but placed in different groups.

Group and period are it reasonable to place the element 18 X 40:

From 18 X 40 it is clear that

atomic Number = 18 = Number of electron = Number of proton

mass Number = 40 = Number of Electron + Number of Neutron

So, Number of neutron = 40 - 18 = 22

Electronic Configuration of atmic number 18 = 2,8,8

So, Number of shell = 3 

Outer Most electron = 8

Group = Outer Most electron = 18 ( as outer most shell is stable )

Period = number of shell = 3

(d) If the atomic numbers of the three elements A, B and C are 6, 8 and 10 respectively

(i) Which element has higher electronegativity?

(ii) Which element has a larger atom size?

(iii) In which group does element B belong?

Ans: (i) C ( A higher atomic number higher electronegative )

(ii) A ( Across a Period atomic Mass Decreases )

(iii) Electronic Configuration of 8 = 2,6 

So, Period= 2  Group= 16 

(e) The atomic number of the elements X, Y, and Z are (a -1), a and (a + 1), Y is an inert element in the second period.

(i) Which metal, which non-metal?

(ii) What is their legitimacy?

(iii) Is the compound formed by X and Z ionic or covalent?

Ans: Y is an inert element in the second period i.e. atomic number of Y is 10. So, the atomic number of X is 9 and that of Z is 11.

(i) X is nonmetal as it is on the right side of periodic table and Z is metal as it is on the left side of the periodic table.

(ii) 

(iii) Z can give its outermost 1 electron and X can accept that 1 to become stable. So, they will form an ionic compound.