What information can the positive and negative
numbers on a number line provide

The least penetrating form of radiation is

Read the sentences from the sections "the atoms" and "the electrons." there is a separate box of elements below the main table (and an odd shape for the main table, with a bite taken out of the top) because of how the other parts of the atom – the electrons – are arranged. in other words, the first element in each row starts a new shell containing one electron, and the last element in each row has two of the subshells in the outer shell fully occupied. the two sentences develop the reader's understanding of the article by

If an electromagnetic wave has a frequency of 8 ⋅ 10^14 h z , what is its wavelength? use λ=v/f. the speed of light is 3 ⋅ 10^8 m/s.