Features of Mendeleev’s Periodic Table

Q. What is periodicity?

Q.

Difference between modern periodic table and mendeelevs periodic table.

Q.

What were the criteria used by Mendeleev in creating his periodic table? [3 MARKS]

Q. How can we identify which element is in group and period?

Q. The following questions refer to the Periodic Table.
(a) (i) Name the first and last element in period 2.
(ii) What happens to the atomic size of elements moving from top to bottom of a group?
(iii) Which of the elements has the greatest electron affinity among the halogens?
(iv) What is the common feature of the electronic configurations of the elements in group 7?

(b) Supply the missing word from those in the brackets:
(i) If an element has a low ionization energy then it is likely to be _________ (metallic/non-metallic).
(ii) If an element has seven electrons in its outermost shell then it is likely to have the ________ (largest/smallest) atomic size among all the elements in the same period.

(c) (i) The metals of Group 2 from top to bottom are: Be, Mg, Ca, Sr, Ba. Which of these metals will form ions most readily and why?
(ii) What property of an element is measured by electronegativity?

Q.

(a) In the modern periodic Table, why does cobalt with a higher atomic mass of 58.93 appear before nickel having a lower atomic mass of 58.71?

(c) Why could no fixed position be given to hydrogen in Mendeleev's periodic table?

Q.

Compare and contrast the arrangement of elements in Mendeleev's periodic Table and the Modern Periodic Table. [5 MARKS]

Q.

Which of the following statement is correct in regard to the classification of elements?

(a) Elements in the modern periodic table are arranged on the basis of increasing atomic numbers

(b) Elements in Mendeleev’s periodic table are arranged on the basis of increasing atomic numbers

(c) In the modern periodic table, the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass.

(d) In the modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group.

Q. Which amongst the following elements has the largest atomic size?

1. Beryllium
2. Carbon
3. Oxygen
4. Fluorine

Q. The element with the smallest size in group 13 is ___.

Q. Arrange the following elements in the increasing order of their atomic radii.
Hydrogen, potassium, sodium, lithium

1. Hydrogen < potassium < sodium < lithium
2. Potassium < sodium < lithium < hydrogen
3. Hydrogen < lithium < sodium < potassium
4. Potassium < hydrogen < lithium < sodium

Q. According to Mendeleev’s periodic table, the vertical columns and horizontal rows are respectively called as:

1. Groups and Rows
2. Rows and Periods
3. Groups and Periods
4. Periods and Groups

Q.

Mendeleevs periodic table also suffered from a lot of defects. Answer the following questions in keeping in mind the defects of Mendeleevs periodic table.

What is meant by Anomalous pair?

Q.

What are the consequences of hydrogen use?

Q.

Which group of atomic numbers represents the elements of the same group.

1. 12, 20

2. 6, 13

3. 8, 17

4. 3, 15

Q. Mendeleev placed isotopes in his periodic table.

1. False
2. True

Q. Mendeleev placed isotopes in his periodic table.

1. False
2. True

Q. In Mendeleev’s periodic table, the vertical columns are called and horizontal rows are referred to as .

1. groups
2. periods
3. classes
4. blocks

Q. From top to bottom in any group of the periodic table the electropositive character of the element:

1. Increases
2. Decreases
3. Changes irregularly
4. Remains unchanged

Q.

A total of _____ elements were known when Mendeleev proposed his periodic table.

Q. The following diagram shows a part of the periodic table in which the elements are arranged according to their atomic numbers. (The letters given here not the chemical symbols of the elements):

a 3	b 4		c 5	d 6	e 7	f 8	g 9	h 10
i 11	j 12		k 13	l 14	m 15	n 16	o 17	p 18

(i) Which element has a bigger atom, a or f?
(ii) Which element has a higher valency, k or o?
(iii) Which element is more metallic i or k?
(iv) Which element is more non-metallic, d or g?
(v) Select a latter which represents a metal of valency 2.
(vi) Select a letter which represents a non-metal of valency 2.

Q. Total number of groups in Mendeleev's table are:

1. $8$
2. $7$
3. $9$
4. $10$

Q. What are the salient features of Mendeleév's periodic table?

Q. Isotopes were discovered long after Mendeleev had proposed his periodic table.

1. True
2. False

Q. Hydrogen exhibits the properties similar to both alkali metals and halogens.

1. True
2. False

Q. All the elements in a period of a modern periodic table have the same ______

1. Valence electrons
2. Atomic number
3. Valence shell
4. Mass number

Q. According to Mendeleev’s periodic table, the vertical columns and horizontal rows are respectively called as:

1. Rows and periods
2. Groups and periods
3. Groups and rows
4. Periods and groups