Advertisements
Advertisements
Question
State the modern periodic law for the classification of elements. How many (i) groups and (ii) periods are there in the modern periodic table?
Advertisements
Solution
Modern Periodic Law:
The physical and chemical properties of elements are a periodic function of their atomic numbers.
- There are 18 vertical columns called groups (numbered from 1 to 18).
- There are 7 horizontal rows called periods (numbered from 1 to 7).
RELATED QUESTIONS
Name two elements you would expect to show chemical reactions similar to magnesium. What is the basis for your choice?
Fill in the following blank with suitable word:
Group 18 elements are called ...............
What are the groups in a periodic table? Give two characteristics of each.
Name two elements in Alkali metals.
Answer the following in respect of element `31/15 P`
Give its electronic configuration
An element barium has the atomic number 56. Look up its position in the periodic table and answer the following question.
Is it larger or smaller than caesium (Cs)?
p-block is composed of groups 1 and 2.
Which of the following is the outermost shell for elements of period 2?
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?
If an element X is placed in group 14, what will be the formula and the nature of bonding of its chloride?
