The mass of an electron is

One atomic mass unit is ___.

The atomic mass of an atom is usually not a whole number because it accounts for

How many valence electrons does a chlorine atom have if its electron configuration is 1s2 2s2 2p6 3s2 3p5?

What is the charge of an atom?

What is the charge of the nucleus of an atom?

The number of protons and electrons changes between isotopes of a given element.

Which statement is false?

Which of the following is the configuration for iron?

You do not need to know how many isotopes there are when determining the atomic mass of an element.

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