How are isotopes of different elements placed in the Modern peridic Table?

Answer the following questions: Considering the elements of period 3 in the modern periodic table, answer the following questions : State the most electronegative element in this period.

Answer the following questions: Considering the elements of period 3 in the modern periodic table, answer the following questions : Name the 'element' in which all the shells are completely filled with electrons.

Answer the following questions: Considering the elements of period 3 in the modern periodic table, answer the following questions : Name the element which has one electron in the outermost shell.

The isotopes of an element differ in

The lanthanides are placed in the periodic table at

Mendeleev predicted the existence of certain elements not know at that time. He named two of these elements as eka-aluminium and eka-silicon. a. Name the elements which have taken the place of these elements. b. Mention the group and period of these elements in the modern periodic table. c. Which one of these two elements is a metalloid? d. How many valence electrons are present in eka-silicon? e. Eka-aluminium forms a chloride. What is its formula?

Answer the following questions: State the number of elements in the modern periodic table..

In the following table, six elements A, B, C, D, E and F (here letters are not the usual symbols of the elements) of the modern periodic table with their atomic numbers are given. Write the electronic configuration of C and E.

In the following table, six elements A, B, C, D, E and F (here letters are not the usual symbols of the elements) of the modern periodic table with their atomic numbers are given. If B combines with F, what would be the formula of the compound formed?

In the following table, six elements A, B, C, D, E and F (here letters are not the usual symbols of the elements) of the modern periodic table with their atomic numbers are given. Which of these is an inert gas ?