if the U-235;Pb-207 ratio in a zircon crystal in a sandstone was found to be 1:3 how old is the zircon.

"the periodic table is arranged in order of atomic number."

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let that person have a turn to speak : )

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.