Show:
Subatomic Particles
Atomic Properties
Atomic History
Isotopes
Hodgepodge
100
a positively charged particle
What is the proton?
100
atoms of the same element are
What is the same?
100

Who developed the theory that electrons are in orbitals or distinct energy levels outside the nucleus?

Who is Bohr?

100

Name 2 ways isotopes are distinct from each other

They have different #'s of neutrons; their masses are different

100

This person declared that atoms were tiny indivisible particles that could not be destroyed.

Who is Democritus?

200
a negatively charged particle
What is the electron?
200
The nucleus has this kind of charge.
What is positive?
200

This scientist responsible for discovering the charge on an electron.  How?

Who is Robert Milikan? oil drop experiment

200

This part of the periodic table can be used to determine the number of protons in an atom.

What is the atomic number?

200

The Law that states that a chemical compound always contains the same elements in the exact same proportions by mass? 

What is the law of definite proportions?

300
a neutrally charged particle
What is the neutron?
300
These particles determine the identity of the atom
What is the proton?
300
This scientist discovered the existence of neutrons.
Who is James Chadwick?
300

What is term for the number "35.45" for chlorine (on the periodic table)?  How is it determined?

What is its average atomic mass.  Determined by the weighted average of each naturally occurring isotope of chlorine.

300

What is Avogadro's number?

A mole, equal to 6.022 x 1023

400
These particles make up the mass of the atom.
What are the proton and neutron?
400
These particles are responsible for the properties of an atom.
What is the electrons?
400

Three discoveries by Rutherford, and his experiment.

Gold foil experiment --> protons; dense nucleus; that atom is mostly empty space.

400

What is the isotope name for an element with 20 protons and 22 neutrons?

What is Calcium - 42?

400

How can you know the molar mass of an element?

It is numerically equivalent to the element's average atomic mass in atomic mass units (a.m.u.'s) - found on the periodic table.

500
a particle with a negligible mass
What is the electron?
500
Atoms combine in _______________.
What is small whole-number ratios?
500

Discoverer of electrons, and the name of his model.

Who is JJ Thomson; plum-pudding.

500

What is the mass number and atomic number for an atom with 34 protons and 44 neutrons?

A = 78; Z = 34

500

3 of the 5 postulates of Dalton's atomic theory.  Which one(s) are no longer considered valid?

1)All elements are composed of small particles [atoms]

2)All atoms of the same element have the same mass; atoms of different elements have different masses    [CHANGED]

3)Atoms only combine in small, whole number ratios

4)In chemical reactions, atoms are combined, separated or rearranged.

5)(implied) Atoms cannot be subdivided, created or destroyed. [CHANGED]