What are Isotopes?

What is the sum of protons and neutrons in the nucleus called?

• Atomic Number

• Mass Number

• Isotope Number

• Neutron Number

Why is the average atomic mass a decimal?

• It is the total number of protons and neutrons for an individual isotope.

• It is a weighted average of all isotopes of an element.

• It is the number of neutrons in the nucleus.

• It is the number of protons in the nucleus.

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

• Ions

• Isotopes

• Molecules

• Compounds

What is the total number of protons and neutrons for an individual isotope of an element called?

• Atomic Number

• Mass Number

• Isotope Number

• Neutron Number

How is an isotope name written?

• Element name or symbol followed by the atomic number

• Element name or symbol followed by the mass number

• Element name or symbol followed by the neutron number

• Element name or symbol followed by the electron number

What is the term used to describe atoms of the same element that have different numbers of neutrons?

• Isomers

• Allotropes

• Isotopes

• Alloys

An isotope of carbon has 6 protons and 8 neutrons. What is its mass number?

• 6

• 8

• 14

• 12

If an isotope of carbon has 6 protons and 8 neutrons, what is its mass number?

• 6

• 8

• 14

• 12

What do these isotopes of carbon all have in common?

• neutrons & mass number

• atomic number and neutrons

• atomic number and electrons

• protons, atomic number, and mass number

Tags

NGSS.MS-PS1-1

Why do isotopes of the same element have different mass numbers?

• Because they have different numbers of protons

• Because they have different numbers of electrons

• Because they have different numbers of neutrons

• Because they are found in different parts of the periodic table