A solid element X has four electrons in the outermost shell of its atom. An allotrope Y of this element is used as a dry lubricant in machinery and also in making pencil leads. (a) What is element X? (b) Name the allotrope Y. (c) State whether allotrope Y is a good conductor or non-conductor of electricity. (d) Name one use of allotrope Y (other than lubrication and pencil leads) (e) Name two other allotropes of element X.

A solid element X has four electrons in the outermost shell of its ato

1.	A solid element X has four electrons in the outermost shell of its atom. An allotrope Y of this element is used as a dry lubricant in machinery and also in making pencil leads. (a) What is element X? (b) Name the allotrope Y. (c) State whether allotrope Y is a good conductor or non-conductor of electricity. (d) Name one use of allotrope Y (other than lubrication and pencil leads) (e) Name two other allotropes of element X.
Answer» A solid element X has four electrons in the outermost shell of its atom. An allotrope Y of this element is used as a dry lubricant in machinery and also in making pencil leads. (a) What is element X? (b) Name the allotrope Y. (c) State whether allotrope Y is a good conductor or non-conductor of electricity. (d) Name one use of allotrope Y (other than lubrication and pencil leads) (e) Name two other allotropes of element X.