Metals and Non metals

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A green coating can be seen on a copper vessel when it is exposed to moist air for long what is the mixture of that green material.

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When a solution is acidic in nature the litmus paper will turns __________.

• Blue to Red

• Red to Blue.

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Metals reacts with base solution.

• True

• False

Iron is a element.

• True

• False

There are no more than___ naturally occurring elements.

• 92

• 93

• 94

• 95

Most of the elements are metals.

• True

• False

What is the smallest unit of an element?

• Atom

• Cell

• Molecule

• Fraction