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प्रश्न
An element barium has atomic number 56. Look up its position in the periodic table and answer the following question.
What will be the formula of its phosphate?
उत्तर
\[\ce{Ba3[PO4]2}\] (Barium Phosphate)
संबंधित प्रश्न
Compare and contrast the arrangement of elements in Mendeleev’s periodic Table and the Modern Periodic Table.
How does the chemical reactivity of alkali metals vary on going in group 1 of the periodic table?
What are the periods in a periodic table? Give two characteristics of each.
State the modern periodic law.
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
Give the symbol and valency of the following element and radical.
Sodium
Which of the following statements about the Modern periodic table is correct?
Write an Explanation.
Period
Noble gases are placed in the ______ group in the modern periodic table.
A group of elements in the periodic table is given below (Boron is the first member of the group and Thallium is the last).
Boron, Aluminium, Gallium, Indium, Thallium
Answer the following question in relation to the above group of elements:
If the electronic configuration of aluminium is 2, 8, 3, how many electrons are there in the outer shell of thallium?
