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History of Chemistry
Parts of an Atom
Atomic Masses
Matter
Atomic Numbers
100

The ancient Greek philosopher who came up with the term "atomos" to describe small building blocks for all things.

Democritus

100
The inner part of an atom that contains the proton and the neutron is called the __________.
Nucleus
100

The equation to calculate atomic mass.

atomic mass = protons + neutrons

100

This is anything that takes up space (has a mass).

matter

100
Atomic numbers of an atom are the same as the number of what in an atom?
protons
200

The experiment that led to the discovery of the nucleus.

Gold-foil experiment

200
These particles have a positive charge and are found inside the nucleus.
proton
200

The atomic mass of an element with 5 neutrons and 3 protons.

8

200
The smallest pieces of matter are called __________.
atoms
200
Carbon's atomic number is _______.
6
300

He came up with the "plum pudding" model of the atom.

J.J. Thomson

300
These particles are located within the nucleus, and have no charge.
Neutron
300

The number of protons in an element with 10 neutrons and an atomic mass of 20.

10

300

The name of the scientific discipline that studies matter.

chemistry

300
What element has a number of 56?
barium
400

The name for the model of the atom theorized by Schrodinger.

quantum model

400
These particles are negatively charge and are found outside the nucleus.
electrons
400

The number of neutrons in an element with 9 protons and an atomic mass of 20.

11

400

The name for the change from a liquid state of matter to a solid state of matter.

freezing

400

The name of hydrogen if it had one more proton.

helium

500
The year Niels Bohr came up with the planetary model of the atom.

1913

500
Most of the mass of an atom is located here.
nucleus
500

The atomic mass of selenium if it has 26 neutrons.

60

500

Deposition is the change from this state of matter to this state of matter (2 answers, must state both).

gas to solid

500

Some atoms have more ___________, which makes it an ion and gives it a negative charge

electrons