Questions and Answers
Atomic theory
1.
Positively charged particle of an atom is:
proton
2.
Center of an atom is called:
nucleus
3.
Particle with no electrical charge of an atom is:
neutron
4.
Negatively charged particle of an atom is:
electron, proton, neutron
Match term with definition
5.
Cation
an ion with a positive charge
6.
Anion
an ion with a negative charge
7.
The nuclear model of the atom held that:
the atom had a dense, positively charged nucleus.
8.
What is the name of the researcher who isolated the neutron in 1932?
James Chadwick
9.
Which scientist isolated the proton from the nucleus in 1919?
Ernest Rutherford
10.
Which of the following is the philosopher credited with coining the term "atom"?
Democritus
11.
A particle smaller than an atom:
subatomic particle
12.
What is the value of the charge on an electron?
Negative 1.60 x 10-^19 coulombs
13.
Which scientist discovered the electron?
J.J. Thomson
14.
J.J. Thomson proved that cathode rays were beams of .....
15.
Different forms of the same element, containing the same number of protons but different number of neutrons are:
isotopes
16.
Aufbau Principle
states that each electron occupies the lowest energy orbital available
17.
Pauli's exclusion Principle
principle that states electrons occupying the same orbital must have opposite spin
18.
Hund's Rule
states that every orbital in a subshell has one electron before a single orbital is double occupied with two.