All halogens have 7 electrons in the valence shell.

What is the general name of the elements having 8 electrons in the valence shell of their atoms ?

Which noble gas has less than 8 electrons in the valence shell of its atom ? What is this number ?

The number of electrons in the valence shell of sodium (Na) is........

The number of electrons in the valence shell of an atom cannot be ...... .

Which element has: A total of two shells with three electrons in its valence shell?

Which element has: A total of three shells, with four electrons in its valence shell?

Use the periodic table to answer the following questions. a) Identify elements with five electrons in the outer shell. b) Identify elements that would tend to loose two electrons. c) Identify elements that would tend to gain two electrons. d) Identify the group having metal, non-metal, liquid as well as gas at the room temperature.

In group 15 elements, the number of unpaired electrons in valence shell is____.