Chapter 4 and 5

Question 1

isotopes

Answer 1

atoms with the same number of protons but different number of neutrons in the nucleus of an atom

Question 2

mass number

Answer 2

The total number of protons and neutrons in the nucleus of an atom

Question 3

atomic number

Answer 3

he number of protons and neutrons in the nucleus of an atom

Question 4

atomic mass

Answer 4

the weighted average of the masses of the isotopes of an element

Question 5

atomic mass unit

Answer 5

one-twelfth the mass of a carbon atom having six protons and six neutrons

Question 6

atomic orbital

Answer 6

region of high probability of finding an electron

Question 7

Heisenberg uncertainty principle

Answer 7

states the impossibility of knowing both velocity and posistion of a moving particle at the same time

Question 8

ground state

Answer 8

lowest energy level

Question 9

aufbau

Answer 9

tendency of electrons to enter orbitals of lowest energy first

Question 10

electron configuration

Answer 10

arrangement of electrons around atomic nucleus

Question 11

Pauli exclusion principle

Answer 11

each orbital has at most two electrons

Question 12

photon

Answer 12

discrete bundle of electromagnetic energy

Question 13

quantum

Answer 13

energy needed to move an electron from one energy level to another

Question 14

frequency

Answer 14

number of wave cycles passing a point per unit of time

Question 15

wavelength

Answer 15

distance between wave crest

Question 16

spectrum

Answer 16

separation of light into wavelengths

Question 17

atomic emission spectrum

Answer 17

frequency of light emitted by an element