Atomic Models (History)

This scientist found that electrons have specific amounts of energy and move in specific orbits around the nucleus, like planets around the sun.

• Niels Bohr

• J J Thompson

• Ernest Rutherford

• James Chadwick

He found the positively charged protons in the nucleus and said that the electrons moved around the nucleus

• J J Thompson

• Ernest Rutherford

• Niels Bohr

• John Dalton

An atom is electrically neutral because

• the number of protons is equal to the number of neutrons

• the number of protons is equal to the number of electrons

• the number of electrons is equal to the number of neutrons

• Number of neutrons is equal to the number of protons and electrons

Which of the following is true for electron cloud?

• It is neutrally charged

• It is positively charged

• It contains most of the mass of the atom

• It is mostly open space

The smallest unit of an element that maintains its properties is the _______

• atom

• proton

• electron

• nucleus

The number of __________ determines the identity of the element while the number of __________ determines its chemical properties

• neutrons, electrons

• neutrons, protons

• protons, electrons

• protons, neutrons

Which of these models represent the model suggested by J J Thompson

• 
• 
• 
• 

Which model was proposed after the discovery of the nucleus?

• Dalton's

• Thompson's

• Rutherford's

• Bohr's

________ and neutrons have the same mass while ________ has negligible mass.

• protons, electrons

• electrons, protons

• nucleus, electrons

• electrons, nucleus

Protons and Neutrons together are called ________

• nucleus

• nucleons

• atoms

• electrons