Catenation is the ability of an atom to form bonds with other atoms of the same elements. It is exhibited by both carbon and silicon. Compre the ability of catenation of the two elements. Give reasons.

Fill in the blanks: Two atoms of the same element combine to form a molecule. The bond between them is knows as… bond

The atomic number of an element X is 8 and that of element Y is 4. Both these elements can exhibit a valency of :

give names of two elements which are placed in the group of carbon and have same valency?

Carbon (atomic number 6) and silicon(atomic number 14) are elements in the same group of the periodic table give the electronic arrangemetns of the carbon and silicon atoms and state the groups in which these elements occur.

Why does the element silicon not form a graphite-like structure as compared to carbon atom ?

Two elements X and Y have atomic numbers 12 and 16 respectively. Write the electronic configuration for these elements. To which period of the modern perioidic table to these two elements belong? What type of bond will be formed between them and why?

These questions consist of two statements each,printed as Assertion and Reason.While asnwering these questions you are required to chose any one of the following four responses. If both Assertion and Reason are true and Reason in correct explanation of Assertion. If both assertion and Reason are true but reason is not correct explanation of Assertion. If Assertion is true but Reason is false. If both Assertion and Reason are false. Assertion:There are 4 carbon atoms in an oxaloacetic acid molecule,which jions with an acetyl group during step I Krebs' cirtic acid cycle. Reason:There are 6 carbon atoms in citric acid molecule.