Name the elements that determine the weather of a place.

Name the phloem elements .

Name the method used to determine the nature of charge on colloidal particles.

Mendeleev predicted the existence of certain elements not known at that time and named two of them as Eka-silicon and Eka-aluminium. a] Name the elements which have taken the place of these elements. b] Mention the group and the period of these elements in the Modern Periodic Table. c] Classify these elements as metals, non-metals, or metalloids. d] How many valence electrons are present in each?

Name the scientist who determined the speed of light most accurately.

Name and state the rule to determine the direction of a force experienced by a straight current-carrying conductor placed in a magnetic field which is perpendicular to it.

Name the foetal sex determination test.

Name the elements which have the smallest and the largest atoms.

Name three elements that have a single electron in their outermost shells.