Naturally occurring boron is composed of two isotopes. The percent abundance and the mass of each isotope are listed below: 19.9% of ne boron atoms have a mass of 10.013 amu and 80.1% of the boron atoms have a mass of 11.009 amu.
calculate the average atomic mass of boron, you would set up the following calculation:
What

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.

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