SCERT Maharashtra solutions for Science and Technology Part 1 [English] Standard 10 Maharashtra State Board chapter 2 - Periodic Classication of Element [Latest edition]

Dobereiner laid down the _______ rule.

Newlands’ Law of Octaves is applicable upto _______.

X and Y are two elements having similar properties which obey Newlands’s Law of Octaves. The minimum and maximum number of elements in between X and Y respectively are _______.

At the time of Mendeleev _______ elements were known.

In Mendeleev’s periodic table eka- silicon was later named as _______.

In Modern Periodic Table the number of columns and periods are respectively _______ and _______.

_______ is the outermost shell for elements of period 2.

The groups 1 and 2 constitute the _______ block.

Which pair of atomic numbers represents elements in the same group?

Which among the following elements would lose an electron easily?

Which among the following is the largest element?

Arrange the following elements in order of their decreasing metallic character.

Na, Si, Cl, Mg, Al

Which one of the following does not increase while moving down the group of the periodic table?

On moving from left to right in a periodic table, the size of the atom _______.

Which of the following statements about the Modern periodic table is correct?

The d-block elements are called as _______ elements.

The size of an atom is indicated by its _______.

_______ is the distance between the nucleus of the atom and its outermost shell.

Atomic radius is expressed in the unit _______.

The tendency of an element to form cation is the _______ character of that element.

_______ is in liquid form in the halogen family.

While going from top to bottom in a group the atomic radius _______.

The tendency of an element to form anion is the ______ character of that element.

The elements from the zero group are called _______.

Eka boron : Scandium : : Eka Aluminum : _______

Mendeleev's periodic table : atomic mass : : Modern periodic table : _______

Group 1 and 2 : s block : : group 13 and 18 : _______

Group 13 to 18 : p block : : _______ : d block

Two elements in the same position : demerit of Newland's octaves : : place for Isotopes : _______

Beryllium : alkaline earth metal : : sodium: _______

Cl : halogen group : : Ar : _______

Iodine : solid : : bromine : _______

Find the odd one out and give its explanation.

Find the odd one out and give its explanation.

Find the odd one out and give its explanation.

Find the odd one out and give its explanation.

Find the odd one out and give its explanation.

Find the odd one out and give its explanation.

Find the odd one out and give its explanation.

Find the odd one out and give its explanation.

Find the odd one out and give its explanation.

Find the odd one out and give its explanation.

Find the odd one out and give its explanation.

Element A and B follows Newland’s octaves rule. How many elements are there in between A and B?

Write the characteristic of Dobereiner’s triads?

To which element does Newland’s octave rule apply?

Write the molecular formula of the oxide of any one of the elements in Mendeleev’s periodic table.

Write the name of noble gas having 2 electrons in its valence shell.

Write the name of an element having electronic configuration 2,8,2.

Which two elements show an ambiguity regarding their sequence in Mendeleev’s periodic table?

The elements beryllium, magnesium and calcium are in group 2. What will be their valency?

The modern periodic table is divided into which blocks?

What determines the chemical reactivity of elements?

Match the columns.

Match the columns.

Match the columns.

Match the columns.

Match the columns.

According to Newland’s octave rule, chlorine shows similarity with fluorine. Because chlorine is _______.

According to Mendeleev’s periodic law properties of elements are ______.

The number of electrons in the outermost shell of an atom determines the _______.

Electropositivity means ______.

According to Dobereiner’s triads rule, three elements in an increasing order of atomic mass shows _______.

Write the name.

The atom having the biggest atomic size from period 2.

Write the name.

The atom having the smallest atomic radius from zero group.

Write the name.

The family of group 1 elements.

Write the name and symbol of the element from the description.

The most reactive nonmetal.

Write the name.

The element having stable electron configuration from the third period.

Write the name.

A halogen from period 4.

Write the name.

The family of elements having zero valency.

Write the name.

Two elements having two orbits.

Write the name and symbol of the element from the description.

The most electronegative atom.

Write the name.

Highest electropositive element

Write the name.

The atom having smallest atomic radius from group 1.

Write the name.

The group of elements having electronic configuration 2, 2.

The similarity between the properties of the first and eighth elements is called the octave rule.

In Dobreiner's triads, three elements appear to be arranged in ascending order of their atomic number.

While designing the periodic table, Mendeleev considered the chemical and physical properties of the elements.

The modern periodic table has 1 to 7 periods.

The modern periodic table shows the molecular masses of the elements in each frame.

p-block is composed of groups 1 and 2.

To the left of the zig-zag line in the periodic table are the metal elements.

The valency of the elements in group 2 is 1.

Nanometer unit is used to measure atomic radius.

Moving from left to right, the size of the atom decreases.

All the elements in the halogen family are gases.

The elements lithium and beryllium are in the same period because their valencies are similar.

Beryllium and calcium are alkaline earth metals.

The K and L shells of the elements Na and Mg contain electrons.

The number of shells decreases in a group from top to bottom.

The metallic character of the element decreases moving across a period from left to the right.

The size of an atom depends on the number of valence electrons.

Silicon is a metallic element.

On moving down the group metallic character increases.

Electronegativity is the metallic property of an element.

Write an Explanation.

Group

Write an Explanation.

Period

Write an Explanation.

Atomic radius

Write an Explanation.

Electropositivity

Write an Explanation.

Electronegativity

Write scientific reason.

Mendeleev kept vacant places in the periodic table.

Write scientific reason.

There was ambiguity about the correct position of hydrogen in Mendeleev’s periodic table.

Write scientific reason.

Boron and oxygen elements are placed in the second period in periodic table.

Write scientific reason.

There was no definitive place for isotope in Mendeleev’s periodic table.

Write scientific reason.

Lithium and sodium are included in the same group in periodic table.

Write scientific reason.

In same period, boron and oxygen elements have different atomic size.

Write scientific reason.

The metallic character of elements increases while going down the groups.

Write scientific reason.

The non-metallic character increases while going from left to right in a period.

Write scientific reason.

In a group, the size of the atom increases as it goes down from the top.

In group 2, beryllium and calcium elements, calcium is more electropositive element than beryllium.

Write scientific reason.

Elements belonging to the same group have the same valency.

State Dobereiner’s Law of Triads.

State Newland’s Law of Octaves.

State Mendeleev’s Periodic Law.

State the modern periodic law.

Complete the following flow chart.

In the modern periodic table, the positions of 1 to 20 elements are shown here. Identify the elements A and B. Write their atomic number.

Some elements and their atomic radii are given here. Arrange them in decreasing order of their atomic radii. Identify which of the above elements is the biggest atom and which is smallest?

Complete the following chart.

Find the period in which these elements can be placed.

₄Be, ₁₇Cl, ₂He, ₁₃Al

Electronic configuration of element A is 2,8,1. Answer the following questions based on this information.

1. What is the atomic number of element A?
2. Find the group to which this element belongs.

Classify the following elements into Metals and Nonmetals.

S, Mg, Al, P, N, Na.

Distinguish between:

Group - Period

Distinguish between:

s-block - p-block

Distinguish between:

Group 17 - Group 18

Distinguish between:

Mendeleev’s periodic table - Modern periodic table

State Mendeleev’s Periodic Law.

On which basis Mendeleev organised periodic law?

What were the limitations of Dobereiner’s classification?

Describe the merits of Mendeleev’s periodic table?

What are the demerits of Mendeleev’s periodic table?

Write name of elements, symbol, atomic number, electronic configuration of second period in modern periodic table?

Write information about the given atomic numbers in the table. 10, 20, 7.

An X element with atomic number 11 and Y element with atomic number 13 belongs to the third period in the modern periodic table. With this information, give the answers of the below questions.

1. Which element has more metallic character from these two elements?
2. What is the valency of each X and Y elements?
3. Atom size of Y element is smaller than atom size of X element. Explain.

Identify periods of elements and blocks of elements from given electronic configuration?

1. 2, 8, 2
2. 2, 8, 7
3. 2, 1

Position of A, B and C three elements is given in the table from the modern periodic table. Answer the following questions.

1. What is A element metal or nonmetal?
2. Which is the outermost orbit of element B?
3. Identify C element and it's physical state.

3, 1, 2 electrons are in valence shells of X, Y, Z elements. From this information, state the group in which they belong and write their valencies.

Observe the given chart and answer the questions given below.

1. Which elements are in the same row?
2. Which elements have the same column?
3. Which elements are in the 18th column?
4. Which element is more reactive among A and C?
5. Which of the following elements A or B will form compounds?

XY compound is formed by X (Atomic number 11) and Y (Atomic number 17), then answer the questions given below.

1. Determine the position of the element X and Y periodic table.
2. X and Y belongs to which of the following: metals, nonmetals or metalloids?
3. From which block the elements X and Y are?
4. Determine the electronic configuration and valency of these elements.

Observe the periodic table given below and write the answers of the questions.

1. Write the name and valencies of the elements in 3rd row.
2. Classify the elements in this row as metal, nonmetal and metalloids.
3. Which block does nonmetals belong to?
4. Write name of any two metalloid elements.

Make a chart which shows the name of the element, valency, atomic number, electronic configuration in the 2nd row of the modern periodic table and arrange these elements in ascending order of atomic mass.

What physical and chemical properties of elements did Mendeleev consider in compiling the periodic table?

What challenges did Mendeleev face in following periodic law?

Explain structure of modern periodic table in short.

An element has its electron configuration as 2, 8, 2. Now answer the following question. 

What is the atomic number of this element?

An element has its electron configuration as 2, 8, 2. Now answer the following question.

What is the group of this element?

An element has its electron configuration as 2, 8, 2. Now answer the following question.

To which period does this element belong?

An element has its electron configuration as 2, 8, 2. Now answer the following question. 

With which of the following elements would this element resemble?
(Atomic numbers are given in the brackets)
N(7), Be(4), Ar(18), Cl(17)