Parts of the Atom
Has a neutral charge.
What is a neutron?
Who is Democritus?
Tells the number of protons in an atom
What is the atomic number?
The extremely small, positively charged center of an atom.
What is the nucleus?
Name two elements that have similar properties.
Two elements in the same group/family
Name the two particles that make up the Mass Number.
protons + neutrons
English school teacher who revived the theory of the atomos.
John Dalton
In a neutral atom, the number of electrons equals the number of ____________.
What is protons?
Who arranged the periodic table by mass?
Dimitri Mendeleev
Name an element that has 7 electrons in its outtermost energy level.
Fluorine, Chlorine, Bromine, Iodine
Electrons have a (greater/smaller) mass than a proton and are (negative/positive) in charge.
smaller, negative
Who is Thomson?
All atoms of the same element have the same number of __________.
atomic number, protons
What are valence electrons?
outtermost electrons
A neutral atom with 7 electrons and 8 neutrons is an isotope of what element?
Nitrogen
The place where most of the mass of the atom is found.
What is the nucleus?
Determined the Plum Pudding Model was incorrect and was responsible for the gold foil experiment.
Who is Rutherford?
Who is responsible for the modern day periodic table?
Henry Moseley
Why does an atom become an ion?
To become stable
One of copper's (Cu) isotopes has 29 protons and 34 neutrons. What is the correct notation (symbol) for copper-63?
63
Cu
29
How many neutrons in Oxygen-17?
9
What are the two things Rutherford concluded about the atom from the Gold Foil experiment?
Atom is mostly empty space
There is a small, positively charged nucleus
Name group 1, 2, 17 and 18
Alkali metals (1)
Alkaline earth metals (2)
Halogens (17)
Noble gasses (18)
Atoms with the same number of protons but different number of neutrons.
What is an isotope?
Gives the weighted average of all of the isotopes of that element.
What is the atomic mass?