Scientists
Which scientist discovered the proton model?
Rutherford 1918
What is the smallest unit of an element that still has the properties of that element
Atom
What does the atomic number in a neutral atom tell you about an element?
protons and electrons
What is the process by which unstable nuclei lose energy by emitting radation?
Radioactive Decay
Atoms of the same element with different number of neutrons
Isotopes
Which scientist discovered the electron cloud model
Schrodinger and Heisenberg
What are the 3 subatomic particles in an atom
proton, neutron, electron
How many valence electrons do elements in the alkaline earth metals have?
2
What particle(s) is(are) released during alpha decay?
2 protons and 2 neutrons
Which number on the periodic table stays the same for all isotopes of an element
Which scientist discovered the Plum Pudding model
JJ Thomson
What is the dense, positively charged center of an atom called
nucleus
What element can be found in the 4th energy level of the halogen group?
Bromine
What particle(s) is(are) released during beta decay?
an electron
What is the hyphen form of an isotope that has 19 protons and a 21 neutrons?
Potassium-40
Which scientist discovered the solid sphere model
Dalton
What are the negatively charged particles found around the nucleus?
electrons
The name of the force that is able to overcome the repulsive force between protons in an atom is
electromagnetic force
What type of nuclear reaction splits one large atom into 2 smaller ones?
Nuclear fission
What is the nuclear notation for an atom that has 3 protons and 4 neutrons?
7Li
Which scientist discovered the nuclear model
Rutherford 1911
What force holds the nucleus together despite repelling protons?
strong nuclear force
Which of the following elements would be most reactive: Bromine, Chlorine, Nickel, or Krypton
Chlorine
What are the nuclear notations for alpha and beta decay
42He
0-1e
If emerium-163 makes up 69.15% and emerium-165 makes up 30.85% of known copper, what is the average atomic mass of copper?
163.6 amu