Out of all the elements, ______ are natural whereas others are man-made.
A change that occurs naturally is known as ‘natural change’. Whereas, a change that is caused due to the interference of a man is known as ‘man-made change’.
Fill in the following blanks with suitable words :
(a) An element is made up of only one kind of ___
(b) Brine is a ___ whereas alcohol is a ___
(c) Brass is an alloy which is considered a ___
(d) The three important metalloids are ___, ___ and___
(e) The elements which are sonorous are called___