Chemistry Vocab Quiz

The (a)   is a chart created by Scientists to organize the elements according to repeated changes of the properties.

• periodic table
• reaction chart
• element graph
• scientific map

A(n) __________ is a method of representing the electrons in an atom’s outer energy levels using dots and the element’s chemical symbol.

• Lewis dot structure

• Bohr model

• Quantum mechanical model

• Electron cloud model

The smallest piece of an element that still retains the properties of the element is a(n) (a)   .

• atom
• molecule
• compound
• particle

Elements arranged in vertical columns in the periodic table are called (a)   .

• groups
• periods
• rows
• cells

The number of protons in an atom is called the (a)   .

• atomic number
• atomic mass
• electron number
• neutron count

Two elements with the same number of protons but a different number of neutrons are called (a)   .

• isotopes
• isobars
• isotones
• isoforms

__________ is the weighted-average mass of all the known isotopes for an element.

• Atomic mass

• Atomic number

• Molecular weight

• Electron mass

The positively charged center of an atom is the (a)   .

• nucleus
• electron
• proton
• atom

The particles that make up protons and neutrons are (a)   .

• quarks
• atoms
• molecules
• electrons

A(n) (a)   is a horizontal row in the periodic table.

• period
• group
• element
• compound