|position in periodic table|important points and chemical reaction of lanthanoids

Explain the position of actinoids in the periodic table. What is the action of sulphur on lanthanoids ? Calculate the magnetic moment of divalent ion in aqueous solution it its atomic number is 24.

What is the role of positive catalyst in a chemical reaction?

Predict the position of an element with atomic number 55 in the periodic table and explain the chemical behaviour of tha element.

(a) How does the chemical reactiviyt of alkali metals vary on going down in group 1 of the periodic table? (b) How does the chemical reactivity of the halogens vary on going down in group 17 of the periodic table?

Position Of Elements In Periodic Table

Assertion (A): Sixth and seventh periods in the periodic table contains 14 elements. Reason (R): In the periodic table, 14 elements of sixth and seventh periods are known as lanthanoids and actinoids.