Advertisements
Advertisements
Question
Match the atomic number with the following:
A rare gas.
Options
19
15
8
4
2
Solution
2
RELATED QUESTIONS
State modern periodic law.
What is the significance of atomic number in the modern classification of elements? Explain with the help of an example.
What is the main characteristic of the last elements in the periods of the periodic table? What is the general name of such elements?
What are the advantages of the periodic table?
Name two elements in each case:
Transition element
The modern periodic table is divided into which blocks?
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.
An element X which is a yellow solid at room temperature shows catenation and allotropy. X forms two oxides which are also formed during the thermal decomposition of ferrous sulphate crystals and are the major air pollutants.
- Identify the element X
- Write the electronic configuration of X
- Write the balanced chemical equation for the thermal decomposition of ferrous sulphate crystals?
- What would be the nature (acidic/ basic) of oxides formed?
- Locate the position of the element in the Modern Periodic Table.
State the group and period, of the element having three shells with three electrons in valence shell.
Give reason for the following:
Inert gases do not form ion.