Q115 of 196 Page 249

Express each of the following in standard form:

A Helium atom has a diameter of 0.000000022 cm.

Given that, The diameter of a helium atom = 0.000000022 cm


Standard form = 0.22 × 10-7 cm


= 2.2 × 10-1 × 10-7


Using the law of exponent,


= 2.2 × 10-1-7


= 2.2 × 10-8 cm


∴ The standard form is 2.2 × 10-8 cm


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