A sample of silicon rejected for use in an electronic circuit has an impurity of boron at a level of 3 parts per trillion. What is the fraction of boron atoms in the silicon sample as written in scientific notation? In equation form 3 parts per trillion is written as 3/10^12 A) 3 x 10-12 B) 3 x 106 C) 3×10-9 D) 3 x 109

A. 3 x 10-12

Explanation:

Generally, the parts-per notation is used to represent very small concentration without any specific unit.

Parts per million is notated as

Parts per billion is notated as

Parts per trillion is notated as

Hence, 3 parts per trillion will be written as 3 x

The correct option is A.

Explanation:

Below is an attachment containing the solution.

chemists can use the electron cloud model to assign electrons to different atomic orbitals. atomic orbitals also explain the patterns in the periodic table

explanation:

under a microscope, cancer cells may look very different from normal cells. they often have different sizes and some may be larger than normal while others are smaller. cancer cells are often abnormally shaped and the control centre of the cell (the nucleus) may have an abnormal appearance.

i think? ?