Atomic Theory and Models 1

Atomic Theory and Models 1

By William Lovering

Multiple Choice

The law of definite proportions states that a given chemical compound always contains the same _ in the exact same _ by mass.

• elements, compounds

• elements, molecules

• elements, proportions

• proportions, elements

Multiple Choice

Which scientist saw the atom as a solid sphere?

• Dalton
• Thomson
• Rutherford
• Bohr

Multiple Choice

states that, regardless of the amount, a compound is always composed of the same elements in the same proportion by mass

• law of definite proportions

• law of conservation of mass

• law of multiple proportions

• periodic table

Multiple Choice

Who proposed the 'plum pudding' model of the atom?

• o Dalton

• o Thomson

• o Rutherford

• o Bohr

Multiple Choice

Who performed the famous 'gold foil experiment'?

• o Dalton

• o Thomson

• o Rutherford

• o Bohr

Multiple Choice

Who, in 1897, discovered the electron?

• Dalton

• Rutherford

• Bohr

• Thompson

Multiple Choice

Who discovered that atoms have a nucleus?

• Dalton

• Thompson

• Rutherford

• Bohr

Multiple Choice

Which model of the atom was created directly after the cathode ray tube experiment?

• plum pudding

• quantum mechanical model

• atomic model

• bohr model

Multiple Choice

Which experiment discovered the nucleus of the atom?

• cathode ray tube

• gold foil experiment

• heisenberg's uncertainty principle

• flame test experiment

Multiple Choice

Line emission spectrum shown below happens when

• Electron transition from lower to higher energy level.
• Electron transition from higher to lower energy level.
• Electron exist in fixed energy states
• Electron transition between different energy levels.

Multiple Choice

In order to go from ground state to an excited state, an electron must

• emit energy

• absorb energy

• wiggle

Multiple Choice

If an electron moves from n=4 to n=2 it ____

• absorbs energy

• releases energy

Multiple Choice

Each element on the periodic table can be identified by its

• classification as a solid, liquid or gas.

• location on the table.

• ability to react to form compounds.

• unique spectral "fingerprint."

Multiple Choice

When an electron returns to ground state from an excited state, the atom will

• emit energy

• absorb energy

• rotate

• wiggle

Multiple Choice

In which state does an electron have the least amount of energy?

• Excited state

• Ground state

• Orbital

• Bohr model

Multiple Choice

What is the tiny, massive central part of the atom?

• Neutron
• Electron
• Proton
• Nucleus

Multiple Choice

Who discovered the nucleus of an atom?

• JJ Thomson
• Ernest Rutherford
• John Dalton
• Democritus

Multiple Choice

What are electrons?

• Massive, positively charged particles
• Tiny, negatively charged particles
• Clouds of dust in the nucleus
• Neutral particles around the nucleus