PHYSICAL SCIENCE Introductory Review

In order for two elements to be isotopes, what has to be the SAME?

• Protons

• Electrons

• Neutrons

• Mass

If an atom has a mass of 40 amu and an atomic # of 19, what else do you know?

• 19 protons

• 20 neutrons

• 21 neutrons

• 19 neutrons

Which is true about the following atom: 6 protons, 5 neutrons, and 8 electrons

• • - 2 charge ion

• • + 2 charge ion

• neutral

How many neutrons are in a Gold atom?

• 79

• 196

• 118

• 275

Energy is released when __________.

• valence electrons are removed from an atom

• valence electrons are gained by an atom

• 
  a positive ion forms

• A and B

Sodium and Chloride ions have equal but opposite charges

• True

• False

In all covalent bonds, valence electrons are _________.

• lost

• gained

• equal

• shared

Chemical bonds form when atoms ____________.

• 
  gain protons

• Combine their nuclei

• loose their electrons

• share or transfer electrons

Which of the following statements about atomic orbitals is TRUE?

• An atomic orbital can hold any number of electrons.

• An atomic orbital can only hold one electron.

• An atomic orbital defines a region where an electron is most likely to be found.

• 
  An atomic orbital has a specific size and shape.

Which of the following electron configurations represents a noble gas element?

• 1s²2s²2p⁶3s²3p⁵

• 1s²2s²2p⁶

• 1s²2s²2p⁵

• 1. 1s²2s²2p⁶3s¹