Chemistry Vocabulary

Modern model of how electrons orbit the nucleus is called

• atomic number

• quarks

• electron cloud

• isotopes

The number of protons in an atoms nucleus is called

• average atomic mass

• neutrons

• metalloids

• atomic number

A horizontal row of the periodic table is called

• periods

• protons

• metals

• quarks

Atomic particle which is positively charged is called a

• electron

• nucleus

• neutron

• proton

A table of elements arranged according to repeated changes in properties is called

• periodic table

• chemical symbol

• dot diagram

• isotopes

Elements having properties of metal and non-metals is called

• metalloids

• metals

• isotopes

• nonmetals

A Lewis electron dot diagram or electron dot diagram is a representation of the valence electrons of an atom that uses dots around the symbol of the element is called

• nucleus

• mass number

• dot diagram

• groups

A notion of one or two letters representing a chemical element is called

• chemical symbol

• mass number

• periods

• quarks

Associate with one another via the strong force to make up protons and neutrons is called

• groups

• quarks

• metals

• periods

Weighted average mass of the mixture of an element's isotopes is called

• average atomic mass

• atomic number

• electron cloud

• isotopes