Lecture 1: Atomic Structure

Question 1

Atom

Answer 1

Smallest particle of an element that retains the element’s properties

Question 2

Atomic number

Answer 2

Number of protons in nucleus

Question 3

Mass number

Answer 3

Number of protons and neutrons in a nucleus

Question 4

Isotopes

Answer 4

Atoms of the same element with differing mass (have the same atomic # but diff. Mass number)

Same chemical properties but different physical properties

Question 5

Relative atomic mass of an element

Answer 5

Weighted average of isotope masses

Question 6

Isotopic mass

Answer 6

Mass of 1 atom of an isotope

Question 7

Ions

Answer 7

Atoms that have accepted or donated electrons

Question 8

Valency

Answer 8

Number of outer shell electrons an atom owns

Question 9

Periodicity

Answer 9

Repeating chemical properties of chemical elements that occur when put in order of atomic number

Question 10

Ionization energy

Answer 10

Energy input needed to remove an electron from an atom

Question 11

Orbital

Answer 11

Region of space in which the electron lives

Question 12

Shielding

Answer 12

Lessening of the pull of the nucleus by inner electrons

Question 13

Reactions

Answer 13

Reorganization of atoms

Question 14

Smallest form of an element

Answer 14

Atom

Question 15

Smallest form of a compound

Answer 15

Molecule

Question 16

Heisenberg uncertainty principle

Answer 16

You can’t know with certainty both where an electron is and where its going next

Question 17

First periodic table

Answer 17

Devised by dmitri Mendeleev in the 1870s using atomic weights

Question 18

Periodic table blocks

Answer 18

Named after orbital that houses the valence electrons