Vocabulary
Define atomic number.
The number of protons an element has
Physicist from New Zealand observed that the positive charge is concentrated in the center of the atom.
Rutherford
Which subatomic particle is negatively charged
Electron
Which group is most reactive and must be stored in oil or glass tubes?
Alkali Metals
What is the Atomic Symbol for Iron
FE
Define mass number
The sum of protons and neutrons.
Philosopher who argued that all substances were built from only 4 elements.
Aristotle
Which subatomic particle has no charge?
Nuetron
Which group has 8 valence electrons and is least reactive?
Carbon
Which Element has no Nuetrons
Hydrogen
Define valence electrons
Electrons that are in the highest energy level (farthest from the nucleus) of an atom of an element
He developed the first Atomic theory.
Dalton
The atomic number of oxygen is 8. How many electrons does an oxygen atom have
8
Which group is all odorless and colorless?
Noble Gasses
English scientist observed through his experiment that all matter gives off small negatively charged particles that are smaller than an atom
Thomson
Define atom
The smallest particle of an element that retains the properties of that element (must say WHOLE definition)
He called the smallest, uncuttable or indivisible piece of matter atomos.
Democritus
The atomic number of oxygen is 8. It has a mass number of 16. How any protons, neutrons and electrons does this atom have?
24
Explain why atoms that are closer together on the periodic table have similar properties.
They have the same number of valence electrons.
Who had a dream
Dmitri Mendeleev
Define isotope
An atom that has a number of protons as the atomic number, but a different number of neutrons
The first model that explained and demonstrated how electrons behave.
Bhor
An atom of an element has a mass number of 38. It has 20 neutrons in its nucleus. How many protons does that atom have?
Alkali metals are on the left side of the periodic table and Noble gases are on the right. What can you say about the properties of alkali metals and noble gasses?
alkali metals are very reactive (only 1 valence electron) noble gasses are stable (8 valence electrons)
What is Coach Kaufmans sons name?
Wesley