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Section 1

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Made the first list of 30 substances he thought were elements

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Chemistry Science

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4 years ago

Date created

Mar 1, 2020

Cards (25)

Section 1

(25 cards)

Made the first list of 30 substances he thought were elements

Front

Lavoisier

Back

Vertical rows

Front

Family,group

Back

Purpose of the periodic table

Front

To increase our knowledge and to organize them

Back

Repetition of a property on a regular basis

Front

Periodicity

Back

What element is most abundant I the earths atmosphere

Front

Nitrogen 78%

Back

Problem with triads:

Front

Soon more elements were found there were more than 3 similar elements to a group

Back

Groups of 3 elements with similar properties

Front

Triads

Back

Energy released when an electron pins an atom

Front

Electron affinity

Back

Horizontal rowa

Front

Period,series

Back

How does the hardness of the alkali metals compare to that of other metals

Front

They are extremely soft and easily cut

Back

German scientist who made a table almost identical to mendeleevs

Front

Lothar Meyer

Back

Developed the periodic table by arranging elements by atomic mass Left blanks when properties or mass did not fit Predicted properties of the missing elements

Front

Mendeleev

Back

What convinced the scientific community that mendeleevs periodic table worked? And how did this illustrates a good scientific model

Front

He predicted the Elements that were yet to be discovered by leaving blank spaces, it was workable

Back

-Discovered by cavendish -colorless odorless tasteless gas -burns rapidly -ca react with metals to for metallic hydrides

Front

Hydrogen

Back

-gasses or soft crumbly solids -gain electrons in chemical reactions

Front

Nonmetals

Back

Created a list of elements based on triads

Front

Dobereiner

Back

Why is hydrogen by itself?

Front

Because it can gain or lose electron to be stable

Back

Changed the order of the periodic table to that of atomic mass Made all the elements for

Front

Moseley

Back

Why were several elements in mendeleevs table in odd places and how was the problem fixed

Front

They were arranged by the mass so they fixed it by arranging them by their atomic number

Back

-usually solid shiny malleable ductile -lose electrons in chemical reactions

Front

Metals

Back

Elements properties lie between those of metals and non metals

Front

Metalloid

Back

Two types inside the table

Front

A-main B-transition

Back

What was the problem with mendeleevs table

Front

Some elements were out of order when positioned by atomic mass

Back

Modern periodic law

Front

The properties of elements vary with their atomic numbers in a periodic way

Back

Arranged elements by atomic mass

Front

Newlands

Back