Chapter 2.5 The Atomic Theory Today

Question 1

Atom

Answer 1

an electrically neutral, spherical entity composed of a positively charged central nucleus surrounded by one or more negatively charged electrons

Question 2

Proton

Answer 2

positive charge (p+)

Question 3

Neutron

Answer 3

no charge (n^0)

Question 4

Electron

Answer 4

negative charge (e-)

Question 5

Atomic Number (Z)

Answer 5

of protons in the nucleus of the elements atoms

Question 6

Mass Number

Answer 6

total number of protons AND number of neutrons in the nucleus
1 proton = 1 unit of mass #, 1 neutron = 1 unit of mass #

Question 7

Isotopes

Answer 7

Atoms that have different numbers of neutrons and therefore different mass numbers

Question 8

Dalton (da)

Answer 8

SI for atomic mass unit

Question 9

Mass spectrometry

Answer 9

a method for measuring the relative mases and abundances of atomic-scale particles & molecules very precisely

Question 10

Isotopic mass

Answer 10

relative mass of an isotope

Question 11

Atomic Mass

Answer 11

the average of the masses of its naturally occurring isotopes weighted according to their abundances

Question 12

Atomic Mass Unit (amu)

Answer 12

Unit to measure atomic mass

Question 13

Atomic Symbol

Answer 13

Based on its english, latin, or greek name

Question 14

How to find the Number of Neutrons

Answer 14

Mass # - Atomic #

N= A - Z