Elements, Compounds, Mixtures; Ch 4, 11, 12

What is a region around the nucleus of the atom where electrons are likely to be found

• proton

• electron

• electron cloud

• neutron

The smallest particle of an element that maintains the properties of that element.

• neutron

• molecule

• atom

• electron

The average mass of one atom of an element from particles in the nucleus.

• atomic mass

• electron cloud

• periods

• physical property

The number of protons in the nucleus of an atom; used to determine an element's position in the Periodic Table.

• subatomic particle

• electrical charge

• atomic number

• electron cloud

A pure substance that cannot be broken down chemically into simpler substances.

• element

• proton

• nucleus

• electron

The vertical columns on the Periodic Table.

• row

• valence

• groups

• periods

a class of elements characterized by physical properties that include shininess, malleability, ductility, and conductivity and usually lose electrons during chemical reactions

• metal

• nonmetal

• metalloid

• group

Isotopes

• an atom that has the same number of protons as other atoms of the same element do but that has a different number of neutrons

• an atom that has the same number of neutrons as other atoms of the same element do but that has a different number of protons

• an atom that has the same number of electrons as other atoms of the same element do but that has a different number of ions

• an atom that has the same number of protons as other atoms of the same element do but that has different number of charges

What is the name of group 18 on the periodic table?

• Alkali metals

• Lanthanoids

• Noble gases

A negatively charged particle in the electron cloud surrounding the atomic nucleus.

• electron

• period

• proton

• neutron