Phy. Sc. Ch. 19.txt

Good conductors of heat and electricity

ability to reflect light

can be hammered or rolled into sheets

can be drawn into a wire

the sharing of electrons between 2 metals bonded together

group 1 on periodic table

most reactive group of elements; rarely found in nature

elements in which the nucleus breaks down giving off particles and energy

group 2 on periodic table (2 valence electrons); extremely reactive and not found in nature in alone

metal used to produce the brilliant white color in fireworks

groups 3 through 12 on the periodic table

iron, cobalt and nickel

copper, silver and gold

metal used in electric wiring:

the only metal that is liquid at room temperature

two metals used to coat other metals

elements with atomic numbers 58-71

elements with atomic numbers 90-103

element that is best known for nuclear weapons

metals in the Earth's crust that are combined with other elements

in metallic bonding, positively charged metallic ions are surrounded by a ________________.

metals that have one electron in the outer energy level of each atom

metals that have two electrons in the outer energy level

poor conductors; usually gases or brittle solids at room temperature

type of bonding where electrons are shared between two elements

type of bonding when electrons are gained or lost

electrons that can be lost, gained or shared

most common element in the universe; highly reactive

two atoms of the same element bonded together

group 17 on periodic table, usually diatomic molecules

a compound formed when a metal gives an electron to a halogen and they bond together

chemical symbol for table salt:

process when a solid changes directly to a gas skipping the liquid phase

example of substance that goes through sublimation

group 18 on the periodic table

very stable group of elements; full outer energy level

element that is commonly used in blimps and balloons

2 elements used in lighting

makes up 90% of the atoms in the universe

elements that have properties of both metals and nonmetals

elements that form both ionic and covalent bonds

partial conductors, good for computers

group 13 on the periodic table (mixed metals)

group 14 on the periodic table

elements with different molecular structure; carbon, silicon and diamonds are examples

group 15 on the periodic table

group 16 on the periodic table (makes up 20% of air, protects us from the sun's UV rays

important element used in smoke detectors

elements that have more than 92 protons and are unstable

diamond, graphite and quartz are allotropes of ________.

elements that are created by scientists and not found naturally on earth

synthetic elements are found in this group

in the gaseous state, this group forms diatomic covalent molecules

an allotrope of carbon that is hard and is often used in jewelry

an allotrope of carbon that is soft and can be used as a lubricant

when hydrogen reacts with active metals it _______.

group of elements that has two electrons in its outer energy level

this element is a nonmetal but is placed in group 1 because it has 1 electron in its outer level

number of electrons in the outer level of an element