4.18 Isotope

There are _____ neutrons in the stable isotope of rhenium (Re-185).

110

You will need to obtain a periodic table. Tin is an example of an element that has a great number of naturally occurring isotopes. How many neutrons would be present in the isotope tin-120?

70

Why are the atomic masses of isotopes different?

They all have different numbers of neutrons

The isotopes of an element have the same _____ number.

atomic

Atoms with different numbers of neutrons but the same number of protons are called

isotopes

Atoms with the same atomic number but different mass numbers are called _____.

isotopes

There are two common isotopes of the element lithium. The first isotope has 3 protons and 3 neutrons. The second isotope has 3 protons and 4 neutrons. Using the hyphenated notation, what are the names of these two isotopes, respectively?

lithium-6 and lithium-7

When two or more atoms differ only in the number of neutrons that each contains, what property or properties change?

mass only

How many neutrons does the deuterium isotope have?

one

The chemical properties of a given element are dictated by:

the number of protons and the number of electrons

How many neutrons are present in the isotope of nobelium, No-254? Nobelium's atomic number is 102.

152

All oxygen atoms have eight protons. What is the mass number of an oxygen isotope that has nine neutrons? What is the name of this isotope?

17, Oxygen-17

You will need to obtain a periodic table. One isotope of copper is written as copper-63. Each atom of this copper isotope contains ____ protons, ____ electrons, and ____ neutrons.

29, 29, 34

You will need to obtain a periodic table. Tin is an example of an element that has a great number of naturally occurring isotopes. How many neutrons are in tin-119?

69

O-18 has an atomic number of 8. Which of the following shows the correct number of protons, electrons, and neutrons, respectively, in a neutral oxygen atom?

8, 8, 10

Which of the following does not change in isotopes?

Both A and B

Different isotopes of the same element have different chemical properties.

FALSE

Since an element always has a different number of protons, the mass can indicate how many neutrons are in an isotope.

FALSE

The isotopes of an element have different atomic numbers.

FALSE

The number of protons is equal to the mass number of the element.

FALSE

The introduction of a neutron into the nuclear composition of an atom would lead to a change in its atomic number.

False

Atomic mass unit is used to calculate the atomic mass of an element or its isotope.

TRUE

Atoms of the same element can have a different number of neutrons.

TRUE

There are three naturally-occurring isotopes of carbon.

TRUE