Question

Question 115(ii)

Express the following in standard form:

A helium atom has a diameter of $0.000000022cm.$

Answer 1

A helium atom has a diameter of $0.000000022cm.$
Standard form of $0.000000022cm=0.22\times {10}^{-7}=2.2\times {10}^{-7}\times {10}^{-1}=2.2\times {10}^{-8}cm$