Chem. 6.1,2

The first periodic table was published by ______ ______.

Dmitri Mendeleev

Mendeleev arranged elements by increasing ______ ______.

atomic mass

Mendeleev recognized repeating trends or ______ with elements' properties.

periods

When was Mendeleev?

1869

______ discovered a new pattern on the periodic table.

Mosely

Mosely determined that the ___ charge on a nucleus ______ by 1 moving from element to element

positive; increased

Mosely defined his discovery as _____ ___ and based the organization of the PT on this.

Atomic Number

Mosely is responsible for the ____ _____.

Periodic Law

The Periodic Law states: When elements are arranged acording to ______ ____, elements with similar properties occur in ______ intervals. On the PT, they line up in the same ______ or ___.

atomic number; regular; columns; rows

When did Mosley state his research?

1913

What percent of elements are metals?

80

Metals are good _______ of ____ and ______

conductors; heat; electricity

What is the best conductor?

Ag(silver)

What is it called when something reflects light?

luster

Metals have good _____.

luster

At room temp. all metals exist as _____ except ______.

solids; mercury(Hg)

What is the ability to be pulled into wires called?

ductile

What is the ability to be hammered into thin sheets called?

Malleable

Foils must be no thicker than ______ mm.

0.15

Most nonmetals are ____ at room temp.

gases

Nonmetals tend to have properties _____ of metals.

opposite

What does brittle mean?

Breaks before it bends

65% of the human body is made of _______.

Oxygen

Even though ___ in its _______ form is a non-metal, it is an excellent conductor.

C; graphite

How to identify metalloids?

The Boy went down the slide, down over down over

How many metalloids are there?

6

Metalloids are often used in electronics as ______ _____

Semi-conductors

Vertical columns are also called _____.

Families

Groups all have the same _______ ______, causing similar _____ and _______ ______.

valence configurations; chemical; physical properties

The s-block elements are all considered ______ ______.

active metals

Group 1 metals are called _____ ______.

alkali metals

Group 2 metals are called ____ _____.

alkaline earths

____ and ____ are the most abundant elements in the universe.

H;He

He is placed in Group 18 due to its _____ ____ ___.

filled outer shell

H is placed in Group 1 because it has ______.

1s electron

Representative elements are also known as _____ ____ elements.

main group

The main group is made of ___ and ____ blocks

s;p

The main group are mostly found as _____ in nature

compounds

Group 17 elements are called _____.

halogens

Group 18 elements are called ____ ____.

noble gases

Transition metals are in the __ block

d

Transition metals have properties commonly associated with ____.

matals

In transitions metals, elements of a group _____ have similar properties

may not

Some transition metals are found in nature as ____ elements.

free

Inner transition metals are in the __ block

f

Inner transition metals are also know as ____ ___.

rare earths

The top row of the f-block are called_____.

lanthanides

The bottom row of the f-block are called ______.

actinides

Actinides are all _______ and most are ____ _____.

radioactive; man-made

Lanthanides all have ____ _____.

similar properties