Vocabulary #1 T1

Atomic Mass is the

• Amount of neutrons

• Average mass of all isotopes (decimal number on periodic table)

• Amount of protons

• Electrons in an atom

The number of protons in an atom can also be called the

The smallest unit of an element is

• An electron

• A nucleus

• An atom

• An isotope

The mass number is the number of ______________ in an atom.

A subatomic particle that has a negative charge

• Nucleus

• Neutron

• Proton

• Electron

A unit of mass that describes the mass of an atom or molecule.

• Atomic mega unit

• Around mass united

• Atomic mass unit

• Automated mass unit

A neutron is a subatomic particle that is

• neutral and found inside the nucleus

• positive and found inside the nucleus

• neutral and found outside the nucleus

• negative and found inside the nucleus

Isotopes have different amounts of

In chemistry, a period is a _____________ on the periodic table.

• lateral angle

• perpendicular

• horizontal row

• column

In chemistry, a group in a ____________ on the periodic table.

• vertical column

• right angle

• horizontal column

• perpendicular row