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History of Chemistry
Parts of an Atom
Atomic Masses
The Periodic Table
Atomic Numbers
100
Early people were producing these types of changes even though they didn't know what was happening. For example - extracting metals from ores and making jewelry.
chemical
100
The inner part of an atom that contains the proton and the neutron is called the __________.
Nucleus
100
If an atom was enlarged so the electrons were spinning around the stands of a football stadium, how big would the nucleus be?
marble
100

A shortcut to find the number of valence electrons in an element is to look at this on the periodic table.

The group the element is in

100
Atomic numbers of an atom are the same as the number of what in an atom?
protons
200
People thought you could turn iron and lead into what?
gold
200
These particles have a positive charge and are found inside the nucleus.
proton
200
Atomic masses are measured in what?
AMU
200
The s block on the table is these groups

1 and 2

200
Carbon's atomic number is _______.
6
300
The earliest form of chemistry was called _______.
alchemy
300
These particles are located within the nucleus, and have no charge.
Neutron
300
A proton has the atomic mass of what?
1
300

Most elements are the most stable when they have this many valence electrons.

8

300
What element has a number of 56?
barium
400
Names for elements comes from the English or __________ name.
latin
400
These particles are negatively charge and are found outside the nucleus.
electrons
400

A neutron has the atomic mass of what?

1

400

This group is the least reactive (borderline non-reactive) of all the groups on the periodic table.

8. The Noble gasses

400
Why does hydrogen have an atomic number of 1?
because it only has one proton
500
People first realized that an atom had a proton and an electron in which decade?
10's
500
Most of the mass of an atom is located here.
nucleus
500

These two particles are added together when calculating Atomic Mass

Proton and Neutron

500

Metallic character does this (increases/decreases) as you go from left to right across the periodic table

Increases

500
Some atoms have more ___________, which makes it an isotope and gives it a negative charge
electrons