History of Chemistry
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
The inner part of an atom that contains the proton and the neutron is called the __________.
Nucleus
If an atom was enlarged so the electrons were spinning around the stands of a football stadium, how big would the nucleus be?
marble
Elements with Metallic Characteristics can be found where on the Periodic Table?
Left
Atomic numbers of an atom are the same as the number of what in an atom?
protons
People thought you could turn iron and lead into what?
gold
These particles have a positive charge and are found inside the nucleus.
proton
Atomic masses are measured in what?
AMU
Atomic Radius/Size increases as you go down the periodic table and to the...
left
Carbon's atomic number is _______.
6
The earliest form of chemistry was called _______.
alchemy
These particles are located within the nucleus, and have no charge.
Neutron
A proton has the atomic mass of what?
1
What is the most Electronegative Element?
Fluorine
What element has a number of 56?
barium
Names for elements comes from the English or __________ name.
latin
These particles are negatively charge and are found outside the nucleus.
electrons
A neutron has the atomic mass of what?
1
All of the elements in group 8A have 8 valence electrons except
Helium
Why does hydrogen have an atomic number of 1?
because it only has one proton
Who first realized that an atom had a proton and an electron
Ernest Rutherford
Most of the mass of an atom is located here.
nucleus
An electron has a mass of what?
Zero
What happens to the Ionic Radius of an atom as you move from left to right on the period table?
It increases
Average Atomic mass is determined by taking the average mass of all isotopes of a chemical. This is due to atoms of the same element having different numbers of...
Neutrons