science facts

physical property- boiling point

The temperature at which a liquid changes to a gas

physical property- Malleability

the ability of a solid to be hammered without shattering

physical property- Viscosity

A liquid's resistance to flowing

physical property- Conductivity

A material's ability to allow heat to flow

chemical property- Flamability

A material's ability to burn in the presence of oxygen

physical property- hardness

A measure of how easily a mineral can be scratched

Isotopes

Atoms of the same element that have different numbers of neutrons

physical property- density

How tightly packed the matter in a substance is.

Recognizing chemical changes

change in color, production of gas, formation of a precipitate

reactivity

how willingly a substance combines chemically with other substances

ionic bonds

metal and nonmetal, formation of ions, transfer valence electrons

Electron

negative charge, outside nucleus, mass=1/1836

neutrons

no charge, in nucleus, mass=1

covalent bonds

nonmetal + nonmetal, sharing valence electrons

atomic number represents

number of protons or electrons

protons

positive charge, in nucleus, mass=1

atomic mass represents

protons and neutrons