Unit 2 Vocabulary (Atoms)

Smallest particle of an element that still has the element's properties.

• nucleus

• atom

• protons

• period

A pure substance made of only one kind of atom. example: Gold

• neutron

• element

• homogeneous mixture

• metal

Tags

NGSS.MS-PS1-1

A subatomic particle that has a negative charge

• electron

• proton

• neutron

• compound

Tiny region in the center of an atom that contains protons and neutrons and makes up almost all of the atom's mass.

• nucleus

• proton

• electron cloud

• matter

Tags

NGSS.MS-PS1-1

A subatomic particle that has a positive charge and that is found in the nucleus of an atom

• electron

• proton

• element

• metalloid

A subatomic particle that has no charge and that is found in the nucleus of an atom

• nucleus

• neutron

• proton

• electron

area around the nucleus of an atom where the atom's electrons are most likely to be found

• electron cloud

• metalloids

• average atomic mass

• mixture

Chart of elements arranged in rows and columns according to the elements' physical and chemical properties.

• elemental chart of pies

• periodic table of elements

• energy level

• nonmetals

an element that is shiny and that conducts heat and electricity well

• gold

• metal

• neon

• nonmetal

Elements in the groups 3-12 on the periodic table

• nonmetals

• transition elements

• metalloids

• metals