Elements that are soft, brittle and dull.

Are elements that can pass properties of both metals and nonmetals

 a characteristic that describes the atomic composition of a substance.

is a substance that can’t be broken down into smaller components through a chemical reaction.

a table that organized the elements according to their physical and chemical properties.

 the number of protons found in the nucleus of an element's

the mass of an atom’s protons and newtons.

a substance particle with a negative charge that orbits the nucleus.

 a subatomic particle with a positive charge.

a substance particle with no charge.

the smallest particle of an element that still has all the  properties of that element.

the center mass of an atom.It contains protons and neutrons.

anything that occupies and has mass.

a property of a substance that can be observed without changing the identity of the substance identity.\

 an atom whose number of electrons does not equal its number of protons.

elements that have the same number of protons but a different number of neutrons.

the horizontal brown in the Periodic Table. (There are 7 rows in the P.T)

the venetian column in the Periodic Table (18 groups)

Particles that make up the atom. There are Protons, neutrons and electrons.