Ca-20, Ca -21 and Ca-22 have the same number of....

If the average atomic mass for Oxygen is 15.9995amu, is there more O-15 or O-16 isotopes that occur naturally?

Same number of protons and different number of neutrons is best described as a(n)...

Same number of protons and different number of electrons is best described as a(n)...

What two atomic particles have a mass and where are they located?

If the atom is stable, that means that there are equal numbers of what subatomic particles?

The atomic number is the same as...

A Magnesium ion consists of 12 protons, 16 neutrons and 10 electrons. What is the charge on the ion?

A neutral atom of oxygen has atomic number 8 and mass number 18. It has

Who discovered that protons and neutrons form the nucleus?

Which element has more electrons? Mg 2- or Al 2+

An ion with a negative charge is a(n)

What is the mass number for iron if it's atomic number is 26, it has 28 electrons and 20 neutrons?

Who came up with the theory that atoms cannot be created or destroyed and simply change form?

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