Advertisements
Advertisements
प्रश्न
Write the merits of the modern periodic table over Mendeleev’s Periodic table
Advertisements
उत्तर
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
संबंधित प्रश्न
In the Modern Periodic Table, which are the metals among the first ten elements?
In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21, and 38. Which of these have physical and chemical properties resembling calcium?
State modern periodic law.
Fill in the following blank with suitable word:
The basis for modern periodic table is ...............
Explain why, the noble gases are placed in a separate group.
The three elements having chemical symbols of Si, B and Ge are:
(a) all metals
(b) all non-metals
(c) all metalloids
(d) Si is metalloid, B is metal and Ge is non-metal
Which of the following statement is correct in regard to the classification of elements?
(a) Elements in modern periodic table are arranged on the basis of increasing atomic masses.
(b) Elements in Mendeleev's periodic table are arranged on the basis of increasing atomic numbers.
(c) In modern periodic table, the element nickel of lower atomic mass is kept before the element cobalt of higher atomic mass.
(d) In modern periodic table, the isotopes of chlorine having different atomic masses are kept in the same group.
How does the chemical reactivity of the halogens vary on going in group 17 of the periodic table?
What is the number of valence electrons in the atoms of first elements in a period?
What is the major characteristic of the first elements in the periods of the periodic table? What is the general name of such elements?
On the basis of electronic configuration, how will you identify the first element of a period?
What is a group in the periodic table?
Which of the following are the correct characteristics of isotopes of an element?
(i) same atomic mass
(ii) same atomic number
(iii) same physical properties
(iv) same chemical properties
(a) (i), (ii) and (iv)
(b) (ii), (iii) and (iv)
(c) (ii) and (iii)
(d) (ii) and (iv)
Give the group number of following elements present in periodic table
Name two elements in each case:
Transition element
Name the type of elements which have outermost shell incomplete.
Name the type of elements which have one electron short of octet.
The electronic configuration of an element T is 2, 8, 8, 1.
What is the period number of T?
Name an alkali metal in period 3 and halogen in period 2.
Name the noble gas with 3 shells.
Name an element of group 18 which can form compounds.
The horizontal rows in a periodic table are called _____.
In the Modern Periodic Table – atoms of all elements are arranged according to their increasing order of – atomic numbers. An atom of nitrogen has seven protons and seven electrons. State what would be its atomic number.
Name the cation and the anion in the salt – calcium sulphate
Give the symbol and valency of the following element and radical.
Magnesium
Give the symbol and valency of the following element and radical.
Nitrate
What are the elements.
Find the odd one out and give its explanation.
Right or wrong sentence.
The modern periodic table has 1 to 7 periods.
Position of A, B and C three elements is given in the table from the modern periodic table. Answer the following questions.
| Periods | Group 2 | Group 17 |
| 2 | ----- | A |
| 3 | B | ----- |
| 4 | ----- | C |
- What is an element metal or nonmetal?
- Which is the outermost orbit of element B?
- Identify C element and it's physical state.
Elements in the modern periodic table are arranged in ______groups and______ periods.
What is the symbol of the element Tungsten?
Which of the following elements would lose an electron easily?
The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?
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 a similar structure to diamond.
Group 16 elements are collectively called as ______.
The maximum number of electrons that can be accommodated in s, p,d, and f subshells are ______.
Spot the error:
The elements of group 13 are called the carbon family.
An element has 2 electrons in its N shell.
Is it a metal or a non-metal?
