Essential elements required in traces are known as __________ elements.

First period contains ______elements.

Lanthanoid series contains_____________elements.

Essential elements provided to crops by fertilizers

Critical elements are ......

Define : 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 .

Transuranic element is _____________.

Valency of the elements in the halogen group is ____.

Enlist various essential elements requried for the growth of plants.

Which elements in the periodic table are transition elements?