Which is the first element in the periodic table ?

What is the position of the transition elements in the periodic table? Comment in brief?

Predict the position of element in the periodic table satisfying the electronic configuration (n-1) d^2 , ns^2 , for n=4.

What is the position of element in periodic table satisfying the electronic configuration (n-1) d^4 , ns^2 for n =4

The toatal number of inner transition elements in the periodic table is____________.

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?

The 3 elements which were predicted by Mendeleev for which the left blank spaces in the periodic table.

Which elements in the periodic table are transition elements?

Select the appropriate options and complete the following paragraph. (2, 7, 18, 32, atomic mass, atomic number, hydrogen, lithium) In the modern periodic table, all known elements are listed in increasing order of their _____ . It start with the lightest elements . The modern periodic table has ______ group and ____ preiods . The first period contains only ____ elements while the seventh period contains ______ elements .

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