Consider the following table showing symbols, the number of protons, electrons, and neutrons, and the mass number. Each column represents a neutral atom.
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Fill in the third column of this table.

An aluminum isotope consists of 13 protons, 13 electrons, and 14 neutrons. Its mass number is ____.

The mass number of an atom is 15 and its atomic number is 7. the atom probably has...

What is the atomic mass of an atom that has 6 protons, 6 neutrons, and 6 electrons?

Using the periodic table, complete the table to describe each atom. Type in your answers.

Mercury is in the 80th position in the periodic table. how many protons does it have?

Which subatomic particles contribute to an atom's mass number but not its atomic number?

What type of atomic particles will you find inside of the nucleus of an atom?

What is the mass number of a potassium (K) atom that has 20 neutrons?