ps ch 4

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A sodium atom, which has 11 electrons has ___ electrons in its third energy level

Avogadro's number is useful for

An element's atomic number is equal to its number of

What is the mass number of an element that has 19 protons,19 electrons and 20 neutrons

An iron atom has an atomic mass of 56. Its atomic number is 26. How many neutrons does the iron atom have

Two different isotopes of an element have different

Unlike the modern model of the atom, Bohr's model states that

What is the molar mass of an element with an average atomic mass of 9.012 u