Identify the period and group numbers of the element with the electron configuration. [ne]3s23p4

What layer of the atmosphere is directly above the troposphere?

What are the two largest greenhouse gases

The comparison of the number of atoms in a copper coin the size of a penny with the number of people on earth is made to illustrate which of the following? a. that atoms are indivisible b. that atoms are very small c. that atoms are very large d. that in a copper penny, there is one atom for every person on earth