Name the element that shows simplest emission spectrum.

Name the element having the simplest atomic structure in the periodic table.

What can we conclude from the statement that the action and absorption spectrum of photosynthesis overlap? At which wavelength do they show peaks?

State the name of the visible series in hydrogen spectrum?

Name elements of Group 16

Name elements of Group 18

Name the principal element in the solar system.

Write a note on absorption spectrum.

A part of periodic table is shown in the following figure Name any two elements that will have properties similar to that of element 'P'

Name the following: Two elements having a single electron in their outermost shell.