2.1 Atomic Structure and 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

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

• Protons

• Neutrons

• Electrons

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

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

• protons, neutrons

• neutrons, protons

• protons, electrons

• electrons, neutrons

Atomic Mass is...

• protons + neutrons

• neutrons + electrons

• protons + electrons

An element's atomic number _______ changes.

• always

• sometimes

• never

Match the following mass amounts with the proper charge.

• (-) negative

• Protons

• (0) neutral, no charge

• Electron

• (+)positive

• Neutron

Label the element with what the different parts represent.

a

b

c

d

Element Symbol

Element Name

Atomic Mass

Atomic Number