Chemistry Study 2 Test Revision

Everything in test except element symbols

group

A group is a vertical column in which elements on the periodic table are organised because of their reactivity and similar properties

period

A period is a row on the periodic table that all have the same number of electron shells/rings but different amounts of electrons

molecule

A group of two or more different atoms bonded together chemically, same of different element

Lattice

A giant repeating 3D structure of atoms strongly bonded together

element

A pure substance made up of only one kind of atom and share the same number of protons in the nucleus

metal

A metal is an element that has shiny/lustrous, usually solid, bendable, high boiling points, ductile and malleable properties and only come in solids

group 1

Alkai metals

group 2

Alkaline Earth metals

Group 17

Halogens

Group 18

Noble gases

non metals

Elemenst that lack metal properties, not shiny, low boiling points, poor conducatability, brittle, come in solids, liquids and gases

metalloids

A element in between metals and non metals that are brittle, semi conductive depending on their environment and increases with temperature, metal looking

Compounds

A substance made up of two or more different elements chemically combined together bonded in fixed ratios. H2O, CO2, NH3

Molecule elements

the same element bonded together O2, N2, Cl2

Molecule compounds

Different elements bonded together H2O, CO2, NH3

Colloid

A mixture where tiny particles are evenly dispersed but not fully dissolved e.g milk, gelatin and fog

Alloys

mixtures of metals or metal and non metal e.g steel, brass and bronze

Heterogeneous mixture

Not uniform throughout the mixture, can see different parts, not evenly mixed, can be seperated e.g oil and water, cereal in milk, sand and water, salad

Homogeneous mixture

Uniform throughout, same throughout, evenly mixed, cannot see different parts, cannot be seperated e.g salt and water, sugar dissolved in water, air, lemondade fully mixed

Mass number

Protons and neutrons combined to make the mass of a number, bottom number

Atomic mass

Total number of protons- same as electrons, in a element, top number

Proton

Positive charge, in the nucleus

Neutron

neutral charge, in the nucleus

Electron

negative charge, orbiting the nucleus, spread out throughout the electron shell

Nucleus

Body of the element

Electron Shell

Where electrons are places, outside the nucleus, protects that nucleus and how periods are organised

Atoms

Atoms are the building blocks of life, they cannot be destroyed or created or divided. Atoms can combine to created new compounds. Atoms of the same element are all the same. Different elements have different masses.