Atomic Structure, Isotopes and Ions

Front

The atomic number is equal to the number of _____________.

Back

Protons

Front

What is the mass number?

Back

Total number of protons and neutrons.

Front

If X is the symbol for an element, which of the following two symbols represent isotopes of the same element? I. 77 35 X II. 77 33 X III. 81 37 X IV. 81 35 X

Back

I and IV.

Front

What distinguishes a neutral atom from an ion?

Back

A change in the number of electrons.

Front

Isotopes of a given element contain _____________.

Back

The same number of protons but a different number of neutrons.

Front

What is an isotope?

Back

Atoms of the same element with different numbers of neutrons.

Front

Define ion.

Back

An atom or molecule that has a net electrical charge due to the loss or gain of one or more electrons.

Front

What is the charge of a cation?

Back

Positive.

Front

What is the charge of an anion?

Back

Negative.

Front

How do you calculate the mass number of an atom?

Back

Add the number of protons and neutrons.