Unit 1 (Part 1) - The Atom (Chem B)

Who developed the first atomic theory based on scientific evidence and research?

• John Dalton

• Democritus

• JJ Thomson

• Rutherford

Who studied cathode ray tubes and discovered the electron?

• Rutherford

• JJ Thomson

• John Dalton

• Democritus

Who conducted a gold foil experiment and discovered the nucleus?

• John Dalton

• JJ Thomson

• Democritus

• Rutherford

The nucleus of an atom contains...

• protons and neutrons

• electrons and protons

• neutrons and electrons

• protons

Different ions contain different numbers of...

• protons

• neutrons

• electrons

• quarks

Different isotopes contain different numbers of...

• protons

• neutrons

• electrons

• quarks

Which subatomic particle determines what an element is?

• proton

• neutron

• electron

• quark

Phosphorus has an average atomic mass of 30.947 amu and an atomic number of 15. Which isotope of phosphorus is the most common?

• phosphorus-15

• phosphorus-30

• phosphorus-31

• phosphorus-30.947

How many protons are in an atom of strontium (atomic #38)?

• 38

• 87

• 88

• 50

An atom of aluminum has 13 protons, 10 electrons, and 14 neutrons. What is the charge?

• -3

• +3

• +4

• -1

• +1