The mass of an atom, approximately equal to the number of protons and neutrons in the atom​ (a)  

• atomic number
• proton

• ion

• atomic mass

Tags

NGSS.MS-PS1-1

the number of protons in the nucleus of one atom of an element

• net charge

• atomic number

• neutron

• atomic mass

Tags

NGSS.MS-PS1-1

a one- or two-letter notation used to represent an atom of a particular element

• chemical equation

• atomic number

• chemical symbol

• atomic mass

the area surrounding the nucleus of an atom where the electrons are found

• floating

• nucleus

• in the middle

• electron cloud

Tags

NGSS.MS-PS1-1

a pure substance composed of the SAME type of atom throughout

• element

• mixture

• compound

• proton

Tags

NGSS.MS-PS1-1

the columns on a periodic table that arrange the elements by the number of electrons that are in the outermost shell; also called families (UP and DOWN)

• cluster

• groups

• individual

• periods

elements that have properties of BOTH metals and nonmetals, sometimes referred to as semiconductors

• metals

• noble gases

• nonmetals

• metalloids

elements that are typically solid, shiny, malleable, and GOOD conductors of heat and electricity; includes most elements on the periodic table

• metals

• nonmetals

• noble gases

• metalloids

NONREACTIVE nonmetals in Group 18 of the periodic table

• metalloids

• nonmetals

• metals

• noble gases

elements that are typically not shiny, not malleable, and POOR conductors of heat and electricity; usually gases or brittle solids

• nonmetals

• metals

• metalloids

• noble gases