Atoms, Elements, Periodic Table

22 terms by kseptember14 

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Hydrogen

This element does not match the properties of any other group so it stands alone. It is placed above group 1 but it is not part of that group. It is a very reactive, colorless, odorless gas at room temperature (1 outer level electron)

Group 1: Alkali Metals

These metals are extremely reactive and are never found in nature in their pure form. They are silver colored and shiny, their density is extremely low so that they are soft enough to be cut with a knife (1 outer level electron)

Group 2: Alkali earth metals

Slightly less reactive than alkali metals they are silver colored and more dense than alkali metals (2 outer level electrons)

Groups 3-12: Transition metals

These metals have a moderate range of reactivity and a wide range of properties. In general they are shiny and good conductors of hear and electricity, they also have higher densities and melting points than groups 1 and 2 (1/2 outer level electrons)

Lanthanides

These are transition metals that were taken out and placed at the bottom of the table so the table wouldn't be so wide. These are shiny and reactive.

Group 13: Boron Group

Contains one metalloid and 4 metals. reactive. aluminum is in this group and it is also the most abundant metal in the earths crust (3 outer level electrons)

Group 14: Carbon Group

Contains one nonmetal, two metalloids and 2 metals. varied reactivity (4 outer level electrons)

Group 15: Nitrogen Group

contains 2 nonmetals, 2 metalloids, and 2 metals. varied reactivity (5 outer level electrons)

Group 16: Oxygen Group

Contains 3 nonmetals 1 metalloid and 1 metal. reactive group (6 outer level electrons)

Group 17: Halogens

all nonmetals very reactive. poor conductors of heat and electricity tend to form salts with metals (7 outer level electrons)

Group 18: Noble gases

unreactive nonmetals. all are colorless, odorless, gases at room temp. all found in earths atmosphere in small amounts (8 outer level electrons)

Shells

The outer orbital that each element in a group has the same number of electrons in

Valence Electrons

The electrons in the outer shell

Atomic number

The number of protons and electrons in the nucleus of an atom

atomic mass

the mass of the atom, the units to measure atomic mass is amu (atomic mass unit) only the protons and neutrons are significant in the mass since electrons are so much smaller than both of these parts

Protons and calculation

A positeve charge that is found within the nucleus of the atom. To calculate the number of this found in a certain element, you have to find the atomic number of the element because the atomic number is the amout of this that is in the element

Neutrons and calculation

A neutral charge that is found within the nucleus of the atom. to calculate this, you have to subtract the atomic mass and the atomic number

Electrons and calculation

A negitive charge orbits around the nucleus in different shells. to find the amount of this in the element you have to find the atomic number since this amount is the same as the atomic number found in the element

2, 8, 8

The amount of electrons in each shell

Nucleus

The center of an atom which is made up of neutrons and protons

Atoms

very tiny particles that are the building blocks for all matter

Actinides

These are transition metals that were taken out and placed at the bottom of the table so the table wouldn't be so wide. these are all radioactive and are therefore unstable. Elements 95 through 103 do not exist in nature (only labs)

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