Chem Ch. 5.1

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

• J.J. Thomson
• Ernest Rutherford
• Niels Bohr
• James Chadwick

An atom is electrically neutral because

• the numbers of protons and neutrons are equal.

• the numbers of protons and electrons are equal.

• neutrons balance the protons and electrons.

Which subatomic particle determines an atom's identity?

• Proton

• Neutron

• Electron

• Nucleus

Isotopes are elements with a different amount of

• protons
• neutrons
• electrons
• atoms

an element will always have the same number of 

• neutrons
• protons
• isotopes
• atoms

How are electrons arranged in an atom?

• In groups of five
• In energy levels
• By color
• By shape

Emission of light from an atom occurs when an electron

• drops from a higher to a lower energy level.
•    jumps from a lower to a higher energy level.   
•    moves within its atomic orbital.
• falls into the nucleus.

Which model of the atom said that electrons circle the nucleus in orbits of a fixed radius?

• Bohr model
• Quantum mechanical model
• Not true of either model
• Both Bohr and Quantum mechanical model

The ground state is the highest energy state of an atom.

• True
• False

For an electron to change from ground state to an excited stated it must...

• Absorb energy
• Release energy