How many protons, electrons, and neutrons does the following isotope contain? 40 ar

18 protons, 18 electrons, 22 nuetrons

Explanation:

Argon has an atomic # of 18. Atomic #s show the amount of protons and electrons it has. Atomic mass - atomic # = # of nuetrons.  40-18=22

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation:

indium, and thallium have three electrons i think