Isotopes

In an atom, there are three types of subatomic particles. ______ are positively charged, ______ are negatively charged, and ______ are neutral.

• Protons, Electrons, Neutrons

• Electrons, Protons, Neutrons

• Neutrons, Protons, Electrons

• Electrons, Neutrons, Protons

Tags

NGSS.MS-PS1-1

The atomic number tells the number of ______ in an atom, which never changes.

• Protons

• Neutrons

• Electrons

_______ is the average mass of all the isotopes of an element.

• Atomic Mass

• Atomic Number

• Chemical Symbol

• Element Name

An atom of an element with a different number of neutrons and therefore a different atomic mass

• Isotope

• Ion

• Atom

• Particle

Isotopes are atoms of the same element with different ____________.

• Number of Neutrons & Mass Number

• Number of Protons & Atomic Number

• Number of Protons, Neutrons, and Electrons

• Number of Electrons & Mass Number

What is the ATOMIC MASS of the isotope Carbon-14?

• 14

• 6

• 12

• 20

Tags

NGSS.MS-PS1-1

Carbon-14 has ____ protons, ____ electrons, and _____ neutrons.

• 6, 6, 8

• 6, 6, 6

• 6, 6, 14

• 6, 10, 14

Tags

NGSS.MS-PS1-1

Isotopes of the same element have the same number of ________ but a different number of _______.

• protons, neutrons

• neutrons, protons

• protons, electrons

• electrons, neutrons

An atom of phosphorus has an atomic number of 15 and a mass number of 31. How many neutrons does it contain?

• 15

• 16

• 31

• 46

Tags

NGSS.MS-PS1-1

The identity of a chemical element is always determined by which of the following?

• the number of protons it has

• the number of neutrons it has

• the number of electrons it has