Advertisements
Advertisements
Question
Write the merits of the modern periodic table over Mendeleev’s Periodic table
Advertisements
Solution
1) Elements are arranged on the basis of increasing atomic number which is more fundamental.
2) Isotopes of an element can be placed along with parent element.
3) It explains periodicity of properties of elements configuration.
4) Lanthanides and actinides are placed separately.
5) Anomalous pairs of elements like Ar and K having same atomic mass could be justified
APPEARS IN
RELATED QUESTIONS
In the Modern Periodic Table, which are the metals among the first ten elements?
The position of three elements A, B and C in the Periodic Table are shown below –
|
Group 16
|
Group 17
|
|
−
|
−
|
|
−
|
A
|
|
−
|
−
|
|
B
|
C
|
(a) State whether A is a metal or non-metal.
(b) State whether C is more reactive or less reactive than A.
(c) Will C be larger or smaller in size than B?
(d) Which type of ion, cation or anion, will be formed by element A?
Fill in the following blank with suitable word:
The basis for modern periodic table is ...............
How many periods and groups are there in the long form of periodic table?
where should hydrogen be placed in the modern periodic table? Give reason for your answer.
What is the name of those elements which divide metals and non-metals in the periodic table?
Is it possible to have an element having atomic number 1.5 placed between hydrogen and helium?
Which element has two shells, both of which are completely filled with electrons?
How would the tendency to gain electrons change on moving from left to right in a period of the periodic table?
What is the usual number of valence electrons in the atoms of the last element in a period?
What is the fundamental difference in the electron configurations between the group 1 and group 2 elements?
On the basis of electronic configuration, how will you identify the first element of a period?
What are the periods in a periodic table? Give two characteristics of each.
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.
Name two elements in each case:
Transition element
Name the type of elements which have two outermost shell incomplete.
Write a short note.
Structure of the modern periodic table.
What would be the correct order if Zn, Fe, Al and Cu are arranged in increasing order of reactivity?
What is meant in the periodic table by a period?
Name and state the following with reference to the elements of the first three periods of the periodic table.
A covalent compound formed by an element in period 2 and a halogen.
Two elements P and Q belong to the same period of the modern periodic table and are in group 1 and group 2, respectively. Compare the following characteristics in the tabular form.
- Number of electrons in their atoms
- Their tendency to lose electrons
- Their metallic characters
- Formation of their oxides
- Formulae of their chlorides
Name the cation and the anion in the salt – calcium sulphate
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 sodium nitrate
Give the chemical formula of carbonic acid
State the number of elements in Period 1 of the Periodic Table.
Right or wrong sentence.
The K and L shells of the elements Na and Mg contain electrons.
Explain structure of modern periodic table in short.
What is the symbol of the element Tungsten?
Which of the following elements will form an acidic oxide?
Choose an element from period 3 of modern periodic table that matches the description given below in instance. Give a reason for your choice.
It has same valency as Lithium.
The maximum number of electrons that can be accommodated in s, p,d, and f subshells are ______.
______ group elements are called alkaline earth metals.
Explain the position of hydrogen in the periodic table.
A part of modern periodic table is given below. On its basis, answer the following questions:
| Group No. → | 1 | 2 | 13 | 14 | 15 | 16 | 17 | 18 |
| Period ↓ | ||||||||
| 2 | A | B | ||||||
| 3 | E | D | F | C |
Which of the element is a Metalloid?
An element belonging to 3d series of modern periodic table has spin magnetic moment = 5.92 B.M. in +3 oxidation state. The atomic number of elements are ______.
An element ‘M' has 50% of the electrons filled in the 3rd shell as in the 2nd shell. The atomic number of ‘M’ is ______.
Name the following metal:
A metal present in period 3, group 1 of the periodic table.
An element has 2 electrons in its N shell.
State its position in periodic table.
