Fill the gaps on atomic structure

Exercise and reference answers

Missing parts

1. Answer

   99.985

   Choices

   1. 99.985
   2. 99.885
   3. 99.785

2. Answer

   0.015

   Choices

   1. 0.015
   2. 0.025
   3. 0.035

3. Answer

   20,000

   Choices

   1. 20,000
   2. 10,000
   3. 30,000

4. Answer

   1900

   Choices

   1. 1900
   2. 1910
   3. 1890

Complete the statement

Protium is {0} per cent of hydrogen and deuterium is {1}. About one alpha particle in {2} bounced back. Planck worked in {3}.

Instructions

Tap a word to drop it into the empty slot.

Explanation